(cos theta + sin theta) / (cos theta - sin theta )
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( cos theta + sin theta ) / ( cos theta - sin theta )
=( cos theta + sin theta )² /( cos theta - sin theta) ( cos theta + sin theta )
Rationalising the denominator...
=cos² theta + sin² theta + 2× cos theta × sin theta/1
=( cos² theta + sin² theta) +2× cos theta × sin theta
= 1 + 2 × cos theta × sin theta...
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