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If sin beta=sin(2alpha+beta) then find t...

If `sin beta=sin(2alpha+beta)` then find the value of `(cotalpha+cot(alpha+beta))(cot beta-5cot(2alpha+beta))?`

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`((cos alpha)/(sinalpha)+(cos(alpha+beta))/(sin (alpha+beta)))((cosbeta)/(sinbeta)-(5 cos(2alpha+beta))/(sin(2alpha+beta)))`
`(sin(2alpha+beta))/(sinalpha(alpha+beta))((cosbeta)/(sinbeta)-(5 cos(2alpha+beta))/(5 sinbeta))`
`(5 sin beta)/(sin alpha.sin(alpha+beta))((cosbeta-cos(2alpha+beta))/(sin beta))`
`(10 (sin alpha.sin(alpha+beta)))/(sinalpha.sin(alpha+beta))=10 `
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