# Math Help - two trigo problems again

1. ## two trigo problems again

p.200 q15

2. #1: I will just use x instead of theta for sake of typing.

$2cos(3x)sin(x/2)=sin(7x/2)-sin(5x/2)$

$2cos(2x)sin(x/2)=sin(5x/2)-sin(3x/2)$

$2cos(x)sin(x/2)=sin(3x/2)-sin(x/2)$

See the pattern?.

Put it together.

3. sorry i knew how to do it and that is not the question i asked. was my hand writing so bad?
question 1 : was my expression correct?
question 2 : is trial and error the only way to get the correct value of n?