Question

Rewrite with only sin x and cos x.

sin 3x - cos x

Answer 1

Have you considered using \(\sin(a+b) = \sin(a)\cos(b) + \cos(a)\sin(b)\)?

Answer 2

Yes I have but I am still like.. Unsure as to how to get the answer

Answer 3

@tkhunny

Answer 4

Would it just be sin(3x-x) which is sin(2x)? @tkhunny

Answer 5

woops. sorry. i meant sin(3x+x) which is sin (4x) @tkhunny

Answer 6

@jim_thompson5910

Answer 7

@ganeshie8 @mathstudent55

Answer 8

\(\sin(3x) = \sin(x + 2x)\)