$\frac{d}{dx}({x^2} + \cos x)^4 = $

  • A
    $4({x^2} + \cos x)(2x - \sin x)$
  • B
    $4({x^2} - \cos x)^3(2x - \sin x)$
  • C
    $4({x^2} + \cos x)^3(2x - \sin x)$
  • D
    $4({x^2} + \cos x)^3(2x + \sin x)$

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यदि $y = \cos (\sin {x^2}),$ है,तो $x = \sqrt {\frac{\pi }{2}} $ पर $\frac{dy}{dx} = $

यदि $y=\frac{\cos x}{1+\sin x}$ है,तो
$(a)$ $\frac{dy}{dx}=\frac{-1}{1+\sin x}$
$(b)$ $\frac{dy}{dx}=\frac{1}{1+\sin x}$
$(c)$ $\frac{dy}{dx}=-\frac{1}{2} \sec ^2\left(\frac{\pi}{4}-\frac{x}{2}\right)$
$(d)$ $\frac{dy}{dx}=\frac{1}{2} \sec ^2\left(\frac{\pi}{4}-\frac{x}{2}\right)$

'$a$' का एक संभावित धनात्मक मान,जिसके लिए $f^{\prime}(x)=0$ के मूल समान हैं,है

फलन $\sin x \cos x$ का अवकलज ज्ञात कीजिए।

यदि $y = x + \frac{1}{x}$ है,तो

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