Proofs of Double Angle Identities

Lesson#1
Proofs of Double Angle Identities
Exercise 10.3
Double Angle Identities
Prove the following identity:
sin⁡ 2 = 2 sin⁡ cos⁡
Math.Ex.10.3, Part1(10.3)
cos 2α = cos^2 α − sin^2 α = 2cos^2 α−1 = 1 − 2sin^2 α
tan⁡ 2α = (2 tan⁡α)/(1−tan^2 α)
Trigonometric Identities
Chapter No 10
Exercise No 10.3
Mathematics
part 1