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13- Prove that —mM8Mm— = ————— 4 2cotf+Cosecd Coth—cosecO

Answer»

r.h.s=sinA/cotA+cosecA*cotA- cosecA/cotA-cosecA=sinA(cotA-cosecA)/cot²A-cosec²A=sinA* cotA- sinA.cosecA=sinA.cosA/sinA-1=cosA-1

l.h.s=2+ sinA(cotA+ cosecA)/cot²A-cosec²A=2+ sinA.cotA+ sinA.cosecA=2+sinA.cosA/sinA+1=2+cosA-1=cosA-1r.h.s=l.h.s



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