Costheta upon 1-sin theta =1+sintheta upon costheta
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Cos theta/1-sin theta
Cos theta(1+sin theta) /(1-sin theta) (1+sin theta)
=>Cos theta(1+sin theta)/1-Sin^2theta
=>Cos theta(1+Sin theta) /Cos^2theta
=>1+Sin theta/ Cos theta=R.H.S
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