Question

Write the expression as the sine, cosine, or tangent of an angle.

sin 5x cos x - cos 5x sin x

a.cos 6x

b.cos 4x

c.sin 6x

d.sin 4x

Answer 1

@hannahg what do you think ?

Answer 2

I don't know how to start the problem
:(

Answer 3

do you know sin(A-B) formula ?

Answer 4

no....

Answer 5

sin (a-b)=sin(a) cos(b)- cos(a) sin(b)

Answer 6

\[\sin(A-B)=\sin A \cos B -\cos A \sin B \]

Answer 7

doesnt this look similiar to our question ?

Answer 8

ohhh i see. i'll try to solve it:) thankyou!!

Answer 9

@AravindG so i got sin(4x)

Answer 10

very good!! well done ! :)