Using the conditions below

sinA=3/4, A lies in quadrant 2

CosB=12/13, B lies in quadrant 1

Find the following:

Cos (A+B) Tan(A-B)

Cos B/2

Solve the equation in th interval [0,2pie)

2cos^2x-3cosx+1

Use Half angle forumlas to find the exact value of the expression

cos 22.5

cos^2 75 - sin^2 75