Hi,

I've asked for a list of questions from a teacher to do over the holidays. I'm struggling to use the text book to help me.

Could someone provide HOW to do these questions, as I just want to get an idea of what I'm getting next year.

Thanks.

1. Prove that:

a) $\displaystyle sin(x+(pi/4))+sin(x-(pi/4))=sqrt(2)sinx$

b) $\displaystyle sin(x+(pi/)4)sin(x-(pi/4))=sin^2 x - (1/2)$

2. Simplify $\displaystyle (1+sin2x+cos2x)/(1+sin2x-cos2x)$