List of top Mathematics Questions on Derivatives asked in Bihar Board XII

\(\frac{d}{dx} \left[ (1 - \cos 2x) + 2\cos^2 x \right] \)
\(\frac{d}{dx} \left(\sec^2 x - \tan^2 x\right)\)
If \( y = x^{20} \), then \( \frac{d^2y}{dx^2} = \):