1 . Rewrite as a single trig function, then evaluate: 18sin157.5∘cos157.5∘ 2. Use a half angle identity to evaluate.

tan(3π8)

3. Use a sum or difference identity to evaluate.

sin15∘

4. Given: cotA=−247 , where cosA>0 and

cosB=35 where 0

Evaluate:

a) cos2A

b) sinB2

Triangle xyz, with vertices x(-2, 0), y(-2, -1), and z(-5, -2), undergoes a transformation to form triangle x? y? z? , with vertices x? (4, -2), y? (4, -3), and z? (1, -4). the type of transformation that triangle xyz undergoes is a . triangle x? y? z? then undergoes a transformation to form triangle x? y? z? , with vertices x? (4, 2), y? (4, 3), and z? (1, 4). the type of transformation that triangle x? y? z? undergoes is a .