Assignment:
Q1. Prove the identity: cos3θ Ξ 4cos^3θ- 3cosθ
Q2. Prove the identity: cos3θ - cos7θ ÷ sin7θ + sin3θ Ξ tan2θ
Q3. Solve the equation, giving answer in radians in the range 0 to
2π:
Sin2θ - 1 = cos2θ
Provide complete and step by step solution for the question and show calculations and use formulas.