Register to reply 
Proving using calculus without trig identity 
Share this thread: 
#1
Feb2312, 01:35 AM

P: 4

Please I really need help with this hw question
Prove without trig identity that f`(x)=0 for F(x)=Asin^2(Bx+C)+Acos^2(Bx+C) 


#2
Feb2312, 01:47 AM

P: 800




#3
Feb2312, 01:48 AM

P: 4

I can't use trig identy to solve it



#4
Feb2312, 01:50 AM

P: 4

Proving using calculus without trig identity
I mean I'm not allowed to



#5
Feb2312, 03:03 PM

Emeritus
Sci Advisor
HW Helper
PF Gold
P: 7,808




#6
Feb2312, 03:22 PM

HW Helper
P: 1,347




#7
Feb2612, 05:22 PM

P: 4

could you please send me your working for this question??



#8
Feb2612, 05:30 PM

P: 29

It's really simple  just use chain rule to take the d/dx of the whole expression. No trig or any other kinds of tricks necessary. Are you familiar with the use of chain rule?



#9
Feb2612, 05:53 PM

Mentor
P: 21,262




Register to reply 
Related Discussions  
Proving trig identity~  Precalculus Mathematics Homework  6  
Proving a trig identity: set theoretic ideas?  Calculus & Beyond Homework  7  
Proving a trig identity  Precalculus Mathematics Homework  1  
Proving trig identity  Precalculus Mathematics Homework  1  
Proving this trig identity  General Math  3 