Target Exam

CUET

Subject

-- Mathematics - Section B1

Chapter

Applications of Derivatives

Question:

The area bounded by the curve $y=sin\, x$ between x=0 and $x= 2\pi $ is :

Options:

4 sq.units

$4\pi $ sq.units

0

2 sq.units

Correct Answer:

4 sq.units

Explanation:

by symmetry

area from $0 → \frac{π}{2}$

= area from $\frac{π}{2}→π$

= area from $π→\frac{3π}{2}$

= area from $\frac{3π}{2}→2π$

so area = 4 area from $0 → \frac{π}{2}$

$=4\int\limits_{0}^{π/2}\sin xdx$

$=4[-\cos x]_{0}^{π/2}$

= 4 sq. units