Question

sin(x)+sin(7x)

Answer 1

Simplifying? Or is there an equation to solve?

Answer 2

What about it?

Answer 3

Sorry. new to this. as a product of sines/cosine

Answer 4

Hmm, there are multiple angle formulas, but that can get pretty chunky for sin(7x) . . .

Answer 5

I figured sin(6x+x), but I get stuck from there.

Answer 6

or u can use sin C+sin D = 2 sin ((C+D)/2) cos ((C-D)/2)

Answer 7

which gives u 2 sin 4x cos 3x

Answer 8

Ooh, I like that a lot better.

Answer 9

That's a sum-to-product identity, right, @hartnn ?
I never remember those!

Answer 10

yup :)

Answer 11

I need to just print this out and carry it with me:
http://en.wikipedia.org/wiki/List_of_trigonometric_identities

Answer 12

Ahhh. I always have ahard time remembering most of them. Thanks.

Answer 13

welcome all :)

Answer 14

it is in the form of sin c+sin D so if u expand sin equations u will @hartnn equation

Answer 15

sin(7x)+sin(x) = 2 sin 7x+x/2 * cos 7x-x/2

= 2 sin4x cos3x