Question
Question: \(\int _ { 0 } ^ { 2 \pi } \sqrt { 1 + \sin \frac { x } { 2 } } d x =\)...
∫02π1+sin2xdx=
A
0
B
2
C
8
D
4
Answer
8
Explanation
Solution
∫02π1+sin2xdx=∫02πsin4x+cos4xdx=4[sin4x−cos4x]02π
=4[1−0−0+1]=8.
∫02π1+sin2xdx=
0
2
8
4
8
∫02π1+sin2xdx=∫02πsin4x+cos4xdx=4[sin4x−cos4x]02π
=4[1−0−0+1]=8.