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Question
Show that `sqrt((1-cos A)/(1 + cos A)) = sinA/(1 + cosA)`
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Solution
`L.H.S = sqrt((1-cosA)/(1 + cosA))`
`= sqrt(((1-cosA)(1 + cosA))/((1+ cosA)(1 + cosA)))`
`= sqrt((1 - cos^2A)/(1 + cosA)^2`
`= sqrt((sin^2A)/(1+cosA)^2)`
`= sinA/(1 + cosA)`
= R.H.S
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