If $(a)$ and $(b)$ are fixed non-zero constants, then the derivative of $\left(\frac{a}{x^4} - \frac{b}{x^2} + \cos x\right)$ is $(ma + nb - p)$ where

Question

$(m = 4x^3; \, n = -\frac{2}{x^3}; \, p = \sin x)$

$(m = -\frac{4}{x^5}; \, n = \frac{2}{x^3}; \, p = \sin x)$

$(m = -\frac{4}{x^5}; \, n = -\frac{2}{x^3}; \, p = \sin x)$

$(m = 4x^3; \, n = \frac{2}{x^3}; \, p = \sin x)$

Solution

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