Please help me with these 4 questions!! I'm struggling a lot in this unit

Double Angle Identities Worksheet 1. Write each expression in terms of a single trigonometric function. a) 2 sin 0.6 cos 0.6 b) 2 sin 3 cos 3 c) 2sin2cos2 d) cos2 0.45 - sin2 0.45 e) 2cos2 5-1 f) 1- 2 sin?3 2. Write each expression in terms of a single trigonometric function a) 2 sin -cos b) cos2 It sin 2 6 c) 2 cos2 0.5 -1 6 10 10 3. If sin 0 = - and O is in quadrant I, evaluate each expression. a) sin 20 b) cos 20 c) tan 20 4. A value of O is defined. Evaluate the expressions sin 20, cos 20, and tan 20 a cose = and O is in Quadrant II INN b) sin 0 = - 3 , and O is in Quadrant III c) tan 0 = 0.75 and TT