Mathematics
OpenStudy (anonymous):

Evaluate the definite integral: cos(x)/sin^9(x) on the interval from [pi/6,pi/2]

OpenStudy (anonymous):

$\text{Let } u = sin(x) \implies du = cos(x)\ dx$ Should be pretty straight forward from there.

OpenStudy (anonymous):

does sin^9(x) become sin^-9(x)?

OpenStudy (anonymous):

If you like, sure. It actually becomes $$u^{-9}$$

OpenStudy (anonymous):

so i will come to get -1/8(sin(x)^-8 and i will plug in pi/2 and pi/6 from there?

OpenStudy (anonymous):

$\text{Let } u = sin(x) \implies du = cos(x)\ dx$$\large\implies \int_{\pi/6}^{\pi/2}\frac{cos(x)}{sin^9(x)}\ dx$$\large=\int_{1/2}^1\frac{1}{u^9}\ du$$\large = \int_{1/2}^1 u^{-9}$$\large= -\left.\frac{1}{8u^8}\right|^1_{1/2}$

OpenStudy (anonymous):

Or yeah, plugging in the original limits is also fine if you convert back to the original function instead of using u.

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