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>> No.1665477 [View]
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1665477

>>1665466
Continue, your excuses make me laugh.

>> No.1317351 [View]
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1317351

basic integration by parts. Derivation is from chain rule of differentiation which says:

d(uv)/dx= v.du/dx + u.dv/dx

d(uv)/dx - v.du/dx = u.dv/dx

Integrate both sides

u.v-S (v.du/dx)dx = S (u.dv/dx)dx

this rite?

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