$\int uv dx=$ কত ?

$u \int v d x+\int\left\{\frac{d u}{d x} \int v d x\right\} d x$

$u v \int d x+\int\left\{\frac{d u}{d x} \int v d x\right\} d x$

$u \int v d x-\int\left\{\frac{d u}{d x} \int v d x\right\} d x$

$u \int v d x-\int\left\{\frac{d v}{d x} \int u d x\right\} d x$