Question: Differentiate:

(a) \(f\left( x \right)=\arcsin \left( 2{{x}^{2}} \right)\)

(b) \(f\left( x \right)=\sqrt{2-{{x}^{2}}}+2\arcsin \left( \frac{x}{2} \right)\)

(c) \(y=\frac{\cosh x}{\sinh x-1}\)