# Evaluate: $\rm \int_{0}^{\pi/2}\cos 2x\ dx$

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Evaluate: $\rm \int_{0}^{\pi/2}\cos 2x\ dx$

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Correct Answer - Option 1 : 0

Concept:

Definite Integral:

If ∫ f(x) dx = g(x) + C, then $\rm \int_a^b f(x)\ dx = [ g(x)]_a^b$ = g(b) - g(a).

Calculation:

Let I = $\rm \int_{0}^{\pi/2}\cos 2x\ dx$

⇒ I = $\rm \left[\frac{\sin 2x}{2}\right]_0^{\pi/2}$

⇒ I = $\rm \left[\frac{\sin \pi}{2}-\frac{\sin 0}{2}\right]$

⇒ I = 0.