prove that: 3sin⁻¹x = sin⁻¹(3x-4x³) ; x∈ [-1/2 ,1/2]

prove that: 3sin⁻¹x = sin⁻¹(3x-4x³) ; x∈ [-1/2 ,1/2]

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Prove that 1. 3sin^-1x=sin^-1(3x-4x^3) 2. 3cos^-1x=cos^-1(4x^3-3x) || exercise2.2 12th Q1 and Q2