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Why substitution of trigonometric functions like Sin(a) works during differentiation even though their range is not as that of true function ? eg:sin^-1 (3x-4x³), substituting x=Sin(a)

Answer» Why substitution of trigonometric functions like Sin(a) works during differentiation even though their range is not as that of true function ?
eg:sin^-1 (3x-4x³), substituting x=Sin(a)


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