જો સંકલન $\int \frac{\cos 8x + 1}{\cot 2x - \tan 2x} dx = A \cos 8x + k$ હોય,જ્યાં $k$ એ સ્વૈચ્છિક અચળાંક છે,તો $A$ ની કિંમત શોધો.

  • A
    $-\frac{1}{16}$
  • B
    $\frac{1}{16}$
  • C
    $\frac{1}{8}$
  • D
    $-\frac{1}{8}$

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વિધાન $(A)$: જો $I_n = \int \cot^n x \, dx$ હોય,તો $I_6 + I_4 = \frac{-\cot^5 x}{5}$ થાય.
કારણ $(R)$: $\int \cot^n x \, dx = \frac{-\cot^{n-1} x}{n-1} - \int \cot^{n-2} x \, dx$.

જો $\int \frac{x^2-x+2}{x^2+x+2} d x=x-\log (f(x))+\frac{2}{\sqrt{7}} \operatorname{Tan}^{-1}(g(x))+c$ હોય,તો $f(-1)+\sqrt{7} g(-1)=$

જો $\int(\sqrt{\operatorname{cosec} x+1}) d x=k \tan ^{-1}(f(x))+c$ હોય,તો $\frac{1}{k} f\left(\frac{\pi}{6}\right)=$

જો $\int \frac{dx}{2 \cos x + 3 \sin x + 4} = \frac{2}{\sqrt{3}} f(x) + c$ હોય,તો $f\left(\frac{2 \pi}{3}\right) =$

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