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Find the value of sin(1/2cot^(-1)(-3/4))...

Find the value of `sin(1/2cot^(-1)(-3/4))`

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`cot^(-1)(-3/4)=theta`
`costheta=-3/5`
`sinn(1/2theta)`
`sin(theta/2)`
`costheta=-3/5`
`1-2sin^2(theta/2)=-3/5`
`1+3/5=2sin^2(theta/2)`
`2si^2(theta/2)=8/5`
...
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