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cosA/(1+- sinA) = tan(45^@ +- A/2)...

`cosA/(1+- sinA) = tan(45^@ +- A/2)`

Text Solution

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LHS
`cosA/(1pmsinA)`
`((1-tan^2(A/2))/(1+tan^2(A/2)))/(1+(2tan(A/2))/(1+tan^2(A/2))`
`((1-tan^2(A/2))/(1+tan^2(A/2)))/((tan(A/2)+2tan(A/2)+1)/(1+tan^2(A/2)))`
`(1-tan^2(A/2))/(1+tan(A/2))^2`
`(1-tan(A/2))/(1+tan(A/2))`
`tan(45^@-(A/2))`.
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