Inverse trigonometric functions :  Prove that tan⁻¹ (√ (1-cos x )/(1+cos x ) = x/2

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Inverse Trigonometric Functions : Find the value of cos [ sin⁻¹ (3/5) + sin⁻¹ (5/13)]

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Inverse Trigonometric Functions: Prove that tan⁻¹ [(3a^2 - x^3)/(a^3 - 3ax^2)] = 3 tan⁻¹ x/a

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