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Question
If a = `(2sin theta)/(1 + costheta + sintheta)`, then `(1 + sintheta - costheta)/(1 + sintheta)` is
Options
`1/a`
`1 - a`
`a`
`1 + a`
MCQ
Solution
`a`
Explanation:
Given, `a = (2sintheta)/(1 + costheta + sin theta)`
= `(2sintheta(1 + sintheta - costheta))/((1 + sin theta + cos theta)(1 + sin theta - cos theta))`
= `(2sintheta(1 + sin theta - cos theta))/((1 + sin theta)^2 - cos^2 theta)`
= `(2sintheta(1 + sin theta - cos theta))/(2sin^2 theta + 2 sin theta)`
= `(1 + sin theta - cos theta)/(1 + sin theta) = a`
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