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Polynomials

Prove cos6x=3...

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Prove }\operatorname{cos}6x=32\operatorname{cos}^6x-48\operatorname{cos}^4x+18\operatorname{cos}^2x-1

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Q. Prove the following trigonometric identities.

if cos A + cos²A = 1, prove that sin² A + sin⁴ A = 1

(- 1) \times (- 1) = 1

(1 + {cot}^{2} A) {sin}^{2} A = 1

(1 - S i n^{2} Θ) S e c^{2} Θ = 1

(A B) (A B)^{- 1} = 1

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