[SOLVED] 6sin8xcos8x ?

**brentwoodbc** · June 9th 2009, 11:31 AM

6sin8xcos8x which expression is equivalent?

sin8x
sin16x
3sin4x
3sin16x

I thought it was like

3(2sin8xcos8x)
3sin^2(2(8x))
3sin^2(16x) ?

**flyingsquirrel** · June 9th 2009, 11:35 AM

Hi,

Originally Posted by brentwoodbc

3(2sin8xcos8x)
3sin^2(2(8x))

The sine is not squared : $2\sin(a)\cos(a)=\sin(2a)$ so $2\sin(8x)\cos(8x)=\sin(16x)$ ...

**brentwoodbc** · June 9th 2009, 11:37 AM

Originally Posted by flyingsquirrel

Hi,

There is no square : $2\sin(a)\cos(a)=\sin(2a)$ so $2\sin(8x)\cos(8x)=\sin(16x)$ ...

your right thank you.

**brentwoodbc** · June 9th 2009, 11:38 AM

is it 3sin16x or sin16x?

**brentwoodbc** · June 9th 2009, 11:39 AM

I think its 3 sin 16x

**flyingsquirrel** · June 9th 2009, 11:48 AM

Originally Posted by brentwoodbc

I think its 3 sin 16x

Yes it is.

Thread: [SOLVED] 6sin8xcos8x ?