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1.

∫Indx=?

A. 1/x
B. 1/x
C. 1/x
D. 1/x

Answer: Option C

Explanation:

দেয়া আছে,

\int I n x d x = \int I n x \times 1 d x = I n x \int 1 \times d x - \int (\frac{d}{d x} I n x \int 1 \times d x) \times d x = I n \times x - \int \frac{1}{x} \times x d x = x I n - \int 1 \times d x = x I n x - x + c = x (I n x - 1) + c

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