# Math Help - kindly explain me solution of integration

1. ## kindly explain me solution of integration

Kindly explain me this solution in detail
I have attached the three questions. I will be highly greatful if anyone of you explain me these solutions in Detail. Thaks a lot

2. Originally Posted by moonnightingale
Kindly explain me this solution in detail
I have attached the three questions. I will be highly greatful if anyone of you explain me these solutions in Detail. Thaks a lot

$\cos^2(2 \pi f_0 t) = (\cos(4 \pi f_0 t)+1)/2$

then as $\cos$ is symetrical in all sorts of ways the right hand side will integrate up to half the area eonclosed in the rectangle enclosing the curve, which has height $1$ and length $T_0$.

(Draw a picture of the curve, it will then be obvious)

CB

3. Originally Posted by moonnightingale
Kindly explain me this solution in detail
I have attached the three questions. I will be highly greatful if anyone of you explain me these solutions in Detail. Thaks a lot

(b) is a direct consequence of (a) (multiply the integral in (a) by $T_0$ to get that in (b)

CB