Easily Find ALL The Solutions To Trigonometric Equations In A Given Interval Using Casio fx-CG50

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⨸ Aʙᴏᴜᴛ Tʜɪs Vɪᴅᴇᴏ ⨸ - Using the SolveN feature on the Casio fx-CG50 we can find a number of different solutions to a trigonometric equation with a given interval. It is a straightforward way of finding the solutions without doing any further calculations.
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[@AceOfHearts001]

This method is actually better if answers are required in exact forms... the Graph app is not able to give intersection values in exact form so often you will need to convert your answers to decimal to check if they are correct if using graph app.

[@a_spire]

This video was very helpful. Thank you!

[@excel7595]

A very helpful video, Thanks a lot!

[@_Ryspect]

Thank you so much! This really helped!

[@garrybolton9681]

That was very helpful. Thank you.

[@andrewzeng607]

So there is no difference to express ≥ and > in the interval, using comma for both?

[@j.p.6716]

This calculator is mind-blowingggggg I might actually get A* now 🤩

[@aligado4108]

I love you lad, u saved me

[@ahmadalmohamad2610]

Thanks 😀😁

[@TechnicalNomad]

Xsinx +cosx=o This eqn solve in fx-991ex class wiz can't change the range that is can't put zero help me out

[@thedude5896]

Hey any updates on how to fix the issue im encountering? i have nothing so far

[@anaymorjaria6447]

what if you need it in terms of pi?

[@ChinhNguyen-xj3us]

Thanks for your tips. I have one problem to ask you that when I want to solve: tan x = 1, 0 ≤ x ≤ 2π on fx-CG50, the answer must be x = π/4 and 5π/4 but I don't know why the calculator just shows only 1 answer which is x = π/4??

[@TheCalculatorGuide]

Not sure, but I guess it may be that only certain results are shown. I am still looking into this.

[@ChinhNguyen-xj3us]

@@TheCalculatorGuideThank for your response. I have found that If I change the angle from radian to degree to Solve tan x =1, 0 ≤ x ≤ 360, it will show full answers which are x = 45 degrees and x = 225 degrees and then we can convert these answers to radian by multiplying them by π/180. So I think when solving tan trigonometric equation we just change to degree to solve and convert the answers to randian.

[@ciaogaming3225]

Hello there, when I’m trying to solve 12cos x^2 - 7cosx + 1 = 0 360 < x < 540 it gives too many solutions I don’t understand why it does this, could I please have some help? Appreciate if you reply ASAP, thank you!

[@TheCalculatorGuide]

Try putting the cos x² in brackets/parentheses first | 12 (cos x)² -7cos x + 1 = 0, x, 360, 540 | See if that gets you the solutions you need.

[@ludypalacios2889]

If I got the same calaculater, how come my calculator doesn't have the las four Icon from H TO L?

[@TheCalculatorGuide]

As stated in a reply to your comment on another video, you have to upload and install them they are extras. education.casio.co.uk/os-files/cg50-add-ins

[@user-zf6px1vq7o]

if you do tanx= 60,x,0,360 you get 2 values, but if you do tan2x=60,x,0,360 you get no solution? why is this the case? it should be showing the two values you had before halfed + additional values that fit within the range after halfing? really worrying me here as i could miss values in the exam, help would be appreciated

[@apocalypticbean]

is there an easy way to solve trig equations with the classwiz?

[@TheCalculatorGuide]

Not an easy way as such. If the Classwiz is in Radians you can use Solve to find a result, but it is usually the closest result so won’t give you all possible solutions. This way on the CG50 is the most comprehensive I’ve come across so far.

[@apocalypticbean]

@@TheCalculatorGuide I am very sad :( Thanks for the reply

[@musicstockerx]

Is this option off during exam mode?

[@sherifhesham9786]

Can you do this on the 991-ex?

[@TheCalculatorGuide]

Unfortunately not, no.

[@axeleli6845]

9750 gives the answer in decimals always not in terms of pi. I think I’ll buy the gc50

[@georgesteyne8143]

could you do a TUTORIAL on how to do stuff like 2sin^2(2x)-cos(2x)-1 = 0 in range 0 to 180. Because i dont know how you do sin^2

[@TheCalculatorGuide]

Should be exactly the same process but will have have a look if I get a chance

[@lemonlime8949]

@@TheCalculatorGuide how do I input ^2 for sin cos and tan because it’s not like how the question is written

[@satoshinakamoto5256]

@@lemonlime8949 (sin 2x)^2

[@Bixen_Bings]

Quick question, how can I change the sin, cos, tan, all into CSC, sec,cot?

[@TheCalculatorGuide]

You have to do them as a fraction. Input for example 1/sin x for Cosec x. Or you can use the x-1 button

[@Bixen_Bings]

@@TheCalculatorGuide huh, not even a feature for CSC,sec, cot, alright thanks, can you also tell me how I can change them into arc, like arcsin, arccos, arctan

[@TheCalculatorGuide]

That is the shift function designated as sin-1 cos -1 and tan-1

[@Bixen_Bings]

@@TheCalculatorGuide ooooh, I honestly thought that was like the cosecant, thanks so much, now I have a lot more confidence in my upcoming tests

[@iqrasamad9269]

hi, how can i do 6cos^2x on the calculator?

[@TheCalculatorGuide]

It must equal a value to calculate. Also your angle must be in radians. You can change it to degrees afterwards if needed.

[@iqrasamad9269]

@@TheCalculatorGuide hi thank you for the reply. It still doesn't allow me to square a sin/cos/tan? could I have a tutorial please

[@TheCalculatorGuide]

@@iqrasamad9269 Sorry i think I misunderstood what your asked originally. Brackets (Parentheses) are the key here. Say your x is 30° . The question is - Find 6cos²(2x). You would input this as follows: 6 , ( , cos , (2x30) , ) , x² . It will look like this 6(cos (2x30))² . Press EXE to get your answer 3/2 .

[@iqrasamad9269]

@@TheCalculatorGuide thank you :)

[@adrianotalavera9474]

When I press the X,theta, T button instead of geting x I get theta, how can I change it?

[@TheCalculatorGuide]

If you don't have anything stored, try resetting the Setup Data from the reset menu in settings. Please bear in mind this may alter other settings which you may have to go back and change. Make sure you have backed up anything you may have in storage

[@adrianotalavera9474]

@@TheCalculatorGuide ok thankyou. I had al ready solve it, so dont worry.

[@thedude5896]

Hey i am encountering an issue where SolveN is only giving me 10 answers when i need more for example : cos x = sin x is there any way to fix that pls

[@TheCalculatorGuide]

Don't know, but at a guess, you may be at the limit at ten. They have to set a limit somewhere as there are an unlimited number of answers....maybe that's it??

[@thedude5896]

@@TheCalculatorGuide is there a way to remove the limit or like change it to 50 if thats the case here?

[@thedude5896]

because i looked alot for a fix but all videos i found were about how to USE SolveN and nothing about there being only 10 solutions

[@junaidiqbal246]

Can we do all this on fx911ex?

[@TheCalculatorGuide]

No there isn't the facility available.

[@junaidiqbal246]

@@TheCalculatorGuide alright ty😊

[@octavylon9008]

it doesnt show more than 10 solutions at once.

[@chandrashekarch9032]

1st comment

[@GoldenNugget56]

this calculator is a cheat code

[@TheCalculatorGuide]

It does feel like it at times...but if it is allowed in exams then it's fine.

[@legendlegend4459]

would they not want working out

[@TheCalculatorGuide]

They might do. It depends on the exam and the what they are asking question. Ideally you need to know how via a non-calculator method with this being an additional skill you can use where possible.

[@luke_dahobo8169]

SolveN(2tan(2x)=5,x,0,2pi) only gives 1 solution when there are actually 4. But if you swap it to SolveN(2tan(2x)=5,x,0,360) it gives you all 4. Does anyone know anything I can do to my calculator so that it doesn't make this mistake for radians anymore?

[@TheCalculatorGuide]

It only works in radians, so you must have your input in radians and then change to degrees after if needed.

[@bpjava2453]

Same!

[@TechnicalNomad]

I wan learn solving trignometic eqn with class wiz make more tutrioal