gai em mayy con nguen ham

N

nguyenbahiep1

tichphan.gif
cos^2 x/sin^6 x

[laTEX]\int \frac{cot^2x.dx}{sin^2x.sin^2x} = \int \frac{cot^2x.(1+cot^2x)dx}{sin^2x} \\ \\ u = cotx \Rightarrow du = -\frac{1}{sin^2x} \\ \\ -\int u^2(1+u^2).du[/laTEX]
 
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