Inverse trigonometric functions (Edexcel IAL P3 3.5)

[@Muhammmmmadd_Haris]

Man those old days when we use to learn SOH CAH TOA, what the heck is this 😭

[@Funnyvidslaughter]

Can you pls explain for Cos & Tan graph as how you did for for Sin graph

[@queend2749]

You do Gods work. Gracias!

[@FlixRacing]

Good luck everyone!

[@Funnyvidslaughter]

Sir also at 16:04 you said that as the range is positive, therefore the cos(K) will be positive, but at 17:10 you are saying for part C for (bi) i understand as you said that in fourth quadrant for cos is positive. (bii) But for sin(K) will be negative, even tan will be negative (In 4th quadrant)

[@Funnyvidslaughter]

Pls explain this part

[@donashen]

The value of tan k we take from sin k/cos k. Cos k remains unchaned and sin k doesn't change because we haven taken it by changing the subject in the question (arcsin x=k). Therefore tan k will also remain the same

[@dearlantsov]

this was so helpful thank you so much

[@MathsDeity]

Glad it was helpful!

[@Suadabdirizak]

Thnk you so much sir ❤❤❤

[@HananBenaissa-m4w]

Hi sorry but I’m confused for Q2. C I thought the tan k would be negative as it is located in the 4th quadrant … where only cos is positive could you explain why I’m wrong?

[@Themarwanzakki]

tan k is located in the third quadrant ,cos is located in the 4th

[@Yosef-101]

Thank You Sir.

[@FlixRacing]

Thank yoU!

[@VijayaLakshmi-un3gv]

C part is not clear for tan.. tan negative in 4 th quadrant

[@MathsDeity]

Could you elaborate further?

[@nh8253]

Hello sir, good day to you! Firstly thank you so much for your videos again. 17:31 Question 2(c) May you explain again how there is no change to the answer of (b)(ii)?

[@donashen]

Because firstly there is no change for cos k as it will be anyways positive when -pi/2

[@antisocialbarbie1587]

thank you