√1-cosA/1+cosA=cosecA-cotA
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multiply root 1-cosA/ 1+cosA by its conjugate i.e. 1-cos A
upperside it will be (1-cosA)(1-cosA)/1- cosA*cosA
after taking out from root it will be 1-cosA/sinA
then do 1/sin A - cos A/ sin A
1/sin A is cosec A and cos A / sin A is cot A
upperside it will be (1-cosA)(1-cosA)/1- cosA*cosA
after taking out from root it will be 1-cosA/sinA
then do 1/sin A - cos A/ sin A
1/sin A is cosec A and cos A / sin A is cot A
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