$$x=\int \sqrt{\frac{y}{2a-y}}dy$$
According to my textbook, it says that the substitution by $y=a(1-\cos\theta)$ will easily solve the intergral. Why does this work?
$$x=\int \sqrt{\frac{y}{2a-y}}dy$$
According to my textbook, it says that the substitution by $y=a(1-\cos\theta)$ will easily solve the intergral. Why does this work?