prove that:
sin q /1- cot q + cos q /1-tan a = cos q+ sin q
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Answer:
cosQ/1-tanQ +sinQ/1-cotQ = sinQ + cosQ
L.H.S= cosQ/ 1- (sinQ/cosQ) + sinQ/ 1-(cosQ/sinQ)
=cos2Q / (cosQ-sinQ) + sin2Q / (sinQ-cosQ)
=cos2Q / (cosQ-sinQ) - sin2Q / (cosQ-sinQ)
=cos2Q-sin2Q / (cosQ- sinQ)
=(cosQ+sinQ)(cosQ-sinQ) / (cosQ- sinQ)
= cosQ+sinQ
L.H.S=R.H.S
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