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prove THAT sin3x=cos3x

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Start by \[\sin(3x)=\sin(2x+x)\] Then use the sum to difference formula
are there any values setfor this question? sin 3x = cos 3x only when tan 3x =1
but not a complete answer

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oh. okay. sub x=0 into the eq and see what u get
X is a angle not a variable
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
i can give you a hint..!
in the case where you need the solution, sin 3x = sin (90-3x) and use the general formula, \(3x=n\pi + (-1)^n (90-3x)\)
that is the solution, not the proof though. So i don't think I gave any help into solving that question. note: \(n \in N\)
u wanna calculate the value of x ?
just find the vale of "X"
sin 45 = cos 45 sin(3*15) = cos(3*15) so x=15 thus sin3x=cos3x your welcome

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