cosA-sinA+1/cosA+sin-1= cosec A + cot A
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Step-by-step explanation:
cosA-sinA+1/cosA+sinA-1
devide by sinA in each term
=cotA-1+cosecA/cotA+1-cosecA
=cotA+cosecA-(cosec²A-cot²A)/(cotA-cosecA+1)
=(cosecA+cotA)(1-cosecA+cotA)/(cotA-cosecA+1)
=cosecA+cotA
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