1. Use a Sum or difference identity to find the exact value of sin285degrees

2. If tanX = -3/4 and 90<x<180, find cosX (the 90 and 180 are degrees)

3. If (tanX)(cscX) = 3, find value of cosX

4. If tanX= 3/4 and 180<X<270, find the exact value of sin2X

5. Find the value of tan(A+b) if cosA = 13/5, tanB = 3/4, and 0<A<90