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int0^pisin^8thetad theta...

`int_0^pisin^8thetad theta`

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`I=int_0^pisin^8thetad theta`
=`2int_0^(pi/2)sin^8thetad theta (becausesin(2cdotpi/2-theta)=sintheta)`
=`2cdot7/8cdot5/6cdot3/4cdot1/2cdotpi/2=(210pi)/768`
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