Introduction to Trigonometry 5 Modal with Answer Sheet Paper AS 1

1. Given that sin sin .cos cos . ( A B A B A SinB + = + ) fin sin 75°
2. If sin cos 2 sin 90 θ θ + = − ( θ ) determine cotθ
3. If tan A = 1 and tan B = root3 evaluate cos A. cos B – sin A. sin B