Question

Rewrite with only sin x and cos x.

sin 3x

Answer 1

sin3x=sin(2x+x)=sin2x*cosx+sinx*cos2x
can you continue??

Answer 2

ahhhhh is it sin x cos2x - sin3x + cos3x

Answer 3

no it is'nt. do you know that sin(a+b)=sina*cosb+sinb*cosa

Answer 4

no. 2 sin x cos2x + sin3x

Answer 5

answer is \[2sinx*\cos ^{2}x+sinx-2\sin ^{3}x \] or;
\[3sinx*\cos ^{2}x-\sin ^{3}x\] or;
\[4sinx*\cos ^{2}x-sinx\]
ok??