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In a prisim mu=(sin[(A+D)//2])/(sin(A//2...

In a prisim `mu=(sin[(A+D)//2])/(sin(A//2))`. Find the formula for the propagation of error in `mu` due to error in A and D.

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The correct Answer is:
`delmu=(sin(A+(D)/(2)))/(1-cosA)delA+(cos.(A+D)/(2))/(2sin.(A)/(2)).delD`
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