more healp please

Question

more healp please

Angle · Answer

we picking from one of these

snowflake0531 · Answer

Oh the half angle one for sine?

Angle · Answer

ye, I like this one

snowflake0531 · Answer

they're adding tho, not multiplying?

Angle · Answer

so you're using critical thinking skills to figure out the x and y values

x+y = 11/2
x-y = 7/2

Angle · Answer

look at that formula right to left, hun

Angle · Answer

we starting on the right side and we end up on the left

Angle · Answer

formulas always work both ways

snowflake0531 · Answer

Oh so 
$$\frac{ 1 }{ 2 }[\sin11x+\sin7x] = \frac{ 1 }{ 2 }[\sin(9x+2x) + \sin(9x-2x)]$$

Angle · Answer

umm not sure about taking the 1/2 out of the inside of the sine

snowflake0531 · Answer

1 and 9/2?

Angle · Answer

@snowflake0531 wrote:

Oh so $$\frac{ 1 }{ 2 }[\sin11x+\sin7x] = \frac{ 1 }{ 2 }[\sin(9x+2x) + \sin(9x-2x)]$$

2 sin(9/2 theta) cos(theta) = sin( 9/2 theta + 1 theta ) + sin( 9/2 theta - 1 theta )

snowflake0531 · Answer

OH multiply 2 on both sides
ohhhhh

Angle · Answer

magic

snowflake0531 · Answer

oh, i got it now xdd

thanks so muchhhhhhhhhhhhhhhhhhhhhhhhhhhhh <3