show that under root 1-cos A /1+ cos A = cosec A + cot A
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L.H.S=(root under)1-cosA/1+cos A
=(root under ) 1-cosA/1+cos A* 1-cosA/1-cosA
=(root under) (1-cosA)2/sin2A {cancel root and square}{2=square}
=1-cosA/sin2A
=1/sinA-cosA/sinA
=cosecA-cotA (ans)
{according to me cosecA-cotA is answer bt in question i can see cosecA+cotA}
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