Question

Area of the region bounded by y = $\left|5sinx\right|$ from x = 0 to $x=4\pi$ and x-axis is

• A. 10
• B. 20
• C. 40
• D. 80

Answer 1

The correct option is C 40

Area = ${\int }_0^{4\pi }\left|5sinx\right|dx=5{\int }_0^{4\pi }\left|sinx\right|dx=20{\int }_0^{\pi }\left|sinx\right|dx=40{\int }_0^{\frac{\pi }{2}}sinxdx=40$