જો $\int \frac{\cos (13 x)-\cos (14 x)}{1+2 \cos (9 x)} d x=\frac{\sin (4 x)}{a}-\frac{\sin (5 x)}{b}+c$ હોય,તો $a^b=$

  • A
    $4^5$
  • B
    $5^4$
  • C
    $4^4$
  • D
    $5^5$

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જો $f(x) = g(x)$ હોય,તો $\int {f'(x) \cdot g(x)} \, dx$ નું મૂલ્ય શું થાય?

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