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If f(x) and g(x) are continuous functions, fog is identity function, g'(b) = 5 and g(b) = a then f'(a) is (1) 2/5(2) 1/5(3) 3/5(4) 5 |
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Answer» Answer is (2) f(g(x)) = x ⇒ f'(g(x)).g'(x) = 1 Put x = b ⇒ f'(g(b)) g'(b) = 1 ⇒ f'(a) x 5 = 1 ⇒ f'(a) = 1/5 |
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