$\int \frac{d x}{\cos (x+4) \cos (x+2)}$ का मान ज्ञात कीजिए।

  • A
    $\frac{1}{\sin 2} \log \left|\cos (x+4)^2\right|+C$
  • B
    $\frac{1}{2} \log \left|\frac{\sec (x+2)}{\sec (x+4)}\right|+C$
  • C
    $\frac{1}{\sin 2} \log \left|\frac{\sec (x+4)}{\sec (x+2)}\right|+C$
  • D
    $\log \left|\frac{\sec (x+4)}{\sec (x+2)}\right|+C$

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Difficult
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यदि $\frac{d}{d x} f(x)=4 x^3-\frac{3}{x^4}$ इस प्रकार है कि $f(2)=0$,तो $f(x)$ किसके बराबर है?

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