1.

f(x) = sin x is increasing inA. (π/2, π)B. (π, 3π/2)C. (0, π)D. (-π/2, π/2)

Answer»

Answer is : D. (-π/2, π/2)

Given: f(x) is sin x

∴ f’(x) = cos x

⇒ f’(x) = cos x

= 0

⇒ for x ∈ (-π/2, π/2)

f’(x) is increasing

∴ f(x) is increasing in (-π/2, π/2).



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