Function # 20 | f(x), f(y), f(x+y), f(xy), x, y based problems

[@mybio4210]

Thank you so much sir !! Pls 1 video per day 🇮🇳

[@real_name_hidden3782]

Finally our hero is back😀

[@jeemaintopper5520]

Bhot sandarr lecture hai ye... For every jee aspirant maza aaa gya sara dar khatm ho gya

[@livetolearn8947]

Thank you very much sir bas aab aaise hi regular rehna aap soch bhi nhi sakte aapki video ki notification dekh kar mujhe kitni khushi mili hai ☺☺☺☺

[@physicsislove843]

physicswallah kaha he....yar .....4 din ho gaye

[@realwinniethepooh135]

Physics wallah is student of rk sir....

[@robertraghawan9808]

Yes today i am damm happy that i learnt how to deal with function equation😀😀😀😀😀😀😀😀😀😀😀😀😀😀

[@sauravchandra10]

Sir itne dino se kaha they?

[@adarshpatel9464]

Best lectures horribly needed jee aspirant ❤❤❤❤❤

[@aaronadvaitanish880]

if f'(x)=a then f'(x+y)=f'(y)+a not just f'(y) so we cannot even conclude f'(x)=f'(y) unless the constant a is 0. In conclusion the steps f'(x+y)=f'(y) and f'(x)=a are contradicting each other except if both f(x) and f(y) have no constant terms in addition in the numerator. (Please Explain) (Video time => 47:12)

[@RKGuptaClasses]

f'(x+y)=f'(y) only because we have assumed x as constant, in the second step. There is not any 'a' in this expression.

[@VijayKumar-iy3ei]

I ,hardly, watch U-tube. But, thanx to lock-down.I have discovered you. I feel fun watching u.Amaazed🤔how simple maths teaching could be? Gr8 job sir. Ireally admire u though i am a maths teacher+2.

[@musicartmania4021]

Awesome sir... Sir please regular.. Your experience is very motivating

[@pujasrivastava7788]

Bahut tagda lecture tha sir...

[@sakshammittal8813]

sir please upload vedios on whole concept of maxima minima

[@satyamev_jayatey_]

Thank you very much guruji!

[@abhishekmaurya4665]

Sir aapne f(x+y) wale explanation mein, f'(x+y)[x variable ; y constant]= f'(x+y)[y variable ; x constant] kaise Maan Liya??? Kya yeh same hain

[@RKGuptaClasses]

When, we are allowed to deal with two independent variables then we can assume this....

[@physicsworld660]

Sir Video ko bhi continous kar dijiya.

[@susmitashit487]

Thanks a lot from heart

[@ishantchauhan2883]

Sir please increasing and decreasing function

[@omanohar12]

superb !!!

[@vaibhavdwivedi7005]

Lekin kuch bhi ho you are the best sir🙏

[@jaibharat5615]

I highly appreciate the hardwork that you have put in the video... Thanks a lot Sir for the brilliant lecture

[@amitkumarmaurya0008]

I am very happy sir

[@livetolearn8947]

Sir please come back regular. I took anhydrous fast and every day prey for your video lectures. Sir please do something agar aapko time nhi milta to aap aapni coaching kai lectures ko hi record karke upload kar dia karo its humble request..

[@vejockey513]

Sir poori srk vibe aa rhi aapse to 😎

[@anmolsharma8477]

Nyc explanation sir Amazing😊✌!!

[@pintooyadav1756]

Good evening Sir 🙏 Good concept 🙏

[@brijmohan1492]

Fully cleared

[@Rkvirus2015]

kha gye the sir aap i miss you now 1 video per day sir request

[@arshadmathematics5714]

Fantastic sir.. Very helpful.. Thanks for kindness

[@fareedullahshahshah10]

Thanks sir from a long time

[@ritanayak8072]

Namaste sirji.

[@sunitadevi-qh3bo]

We need question session

[@aishwaryajaiswal437]

plz start indefinite integration

[@subhashreesamal180]

This vedio very help full to me, thank u very much

[@jassiesingh7108]

AOD Ka remaining topics bhi upload kigiye please sirji

[@deepanshuraghav1497]

Superb 🤘🤘

[@VijayKumar-iy3ei]

I wish i could meet u.

[@bestlofisongs70]

Sir bahut dino ke Baad mile ho

[@somitkesharwani3153]

Thank you very much sir

[@pintusahu1264]

Sir mera ek request tha pata nehi app fullfil karenge ya nehi pls sir i have no idea about trigonometry pls 1st year and 2 nd year milake trigonometry ke uper video banaye pls sir

[@mihirnaidu8014]

Thank you sir love you please 1 video per day

[@Mukendra_Kumar]

Sir wo last wale question me dy/dx ko dx/dy se equate kaise hogya

[@sayanjitb]

He has equated f'(x+y)=f'(x+y) from the previous two equality.

[@suryansh2296]

Mast

[@rishabhranjan9168]

Thank you sir❤️

[@vaibhavdwivedi7005]

Last me -5=b? B=5 hoga

[@user-mj8nn6ek5l]

Yes bro

[@siddusiddharth233]

Thank you

[@DineshKumar-yp4bj]

Nice sir

[@vijaynagare7132]

Sir please integration pe videos banao

[@laxminaidu612]

Babai nuv kathi Em chesav We want more ........

[@princebharati714]

Thanks sir

[@najminahmeda9576]

sir derivative khatam ho gaya?

[@332mohammadirfanmee6]

sir thanku video uploade karne ke liye allah aapko tarkki de

[@sachinmondal9590]

Let f : R → R be a function such that f(x + y) + f(x − y) = f(xy) for all x, y ∈ R. Then f is: A. Strictly increasing. B. Strictly decreasing. C. Identically zero. D. Constant but not necessarily zero.

[@sachinmondal9590]

Any one please solve this question 🙏🙏

[@RKGuptaClasses]

Replace y by -y.... then there is no change in left side, but there is a change in right side... It means that f(-xy)=f(xy) which means that it is an even function for which f(-x)=f(x).... Even function can not be strictly increasing or decreasing... it may be a constant function only... Now let f(x)=k so k+k=k (by putting the values in the given expression) or 2k=k or k=0 only....

[@abhishekmaurya4665]

Strictly increasing

[@friendly_gadget]

Sir you are doing a great job, Sir but please 1 video per day

[@rahulmaurya8173]

Kha the sir ? Aaj bhot bino bad aaye ho

[@Rony-zu3jn]

Nice

[@mathswallahabhi5196]

Sir Pls... Probbality video upload

[@srishti0124]

If u'll upload more videos then obviously u'll grab more subscribers.

[@oldxgold1672]

Sir, AOD complete krwa do

[@MandeepSingh-yl5lo]

Sir kha chal gaye the

[@upsclover51]

Sir please integration ke video

[@movielatest970]

Sir integration start kariye

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Add bahut h video me baki to sb accha hai

[@kiffaolan1294]

Щас бы субтитры на английском

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Thanks sir

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Thank you sir