prove THAT
sin3x=cos3x

Question

prove THAT
sin3x=cos3x

.sam. · Answer

Start by
$$\sin(3x)=\sin(2x+x)$$
Then use the sum to difference formula

anonymous · Answer

are there any values setfor this question?
sin 3x = cos 3x only when tan 3x =1

anonymous · Answer

but not a complete answer

anonymous · Answer

wrong SHADOWYS

anonymous · Answer

oh. okay. sub x=0 into the eq and see what u get

anonymous · Answer

X is a angle not a variable

anonymous · Answer

In this case, since the question is asking for the [[proof]], not the solution, i don't  see how you can get it, without setting the angles into set angles, like $\frac{\pi}{12}$ rad

anonymous · Answer

i can give you a hint..!

anonymous · Answer

in the case where you need the solution, 
sin 3x = sin (90-3x)
and use the general formula,
$3x=n\pi + (-1)^n (90-3x)$

anonymous · Answer

that is the solution, not the proof though. So i don't think I gave any help into solving that question. 
note: $n \in N$

anonymous · Answer

u wanna calculate the value of x ?

anonymous · Answer

just find the vale of "X"

anonymous · Answer

sin 45 = cos 45
sin(3*15) = cos(3*15)
so x=15
thus sin3x=cos3x

your welcome

anonymous · Answer

thanks