Question: Verify that the following are identities (see Example 6). (a) Sin2 v + 1/ sec2 v = 1 (b) Cos 3t = 4 cos3 t

Verify that the following are identities (see Example 6).
(a) Sin2 v + 1/ sec2 v = 1
(b) Cos 3t = 4 cos3 t - 3 cos t
(c) Sin 4x = 8 sin x cos3 x - 4 sin x cos x
(d) (1 + cos θ) (1 - cos θ) = sin2 θ

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