यदि $f(x) = \sin x + \cos x$ है, तो $f\left(\frac{\pi}{4}\right) f^{(iv)}\left(\frac{\pi}{4}\right)$ का मान ज्ञात कीजिए।

  • A
    $1$
  • B
    $2$
  • C
    $3$
  • D
    $4$

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यदि तीन फलन $f(x)$,$g(x)$ और $h(x)$ इस प्रकार हैं कि $h(x) = f(x) \cdot g(x)$ और $f^{\prime}(x) \cdot g^{\prime}(x) = c$,जहाँ $c$ एक स्थिरांक है,तो $\frac{f^{\prime \prime}(x)}{f(x)} + \frac{g^{\prime \prime}(x)}{g(x)} + \frac{2c}{f(x) \cdot g(x)}$ का मान क्या होगा?

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यदि $\sqrt{x+y}+\sqrt{y-x}=5$,तो $\left(\frac{d^{2} y}{d x^{2}}\right)=$

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