What is the value of (tan A+ cotA+ secA)( tanA+cotA- secA)
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(tanA+cotA+secA)(tanA+cotA-secA)
=>tanA(tanA+cotA-secA)+cotA(tanA+cotA-secA)+secA(tanA+cotA-secA)
=>tan²A+1-tanAsecA+1+cot²A-cotAsecA+secAtanA+cotAsecA-sec²A {tanAcotA = 1}
=>tan²A+1+cot²A-sec²A+1
=>sec²A+cot²A-sec²A+1 {1+tan²A = sec²A)
=>cot²A+1
=>cosec²A
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Crystall91:
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tell me, do you have any doubts regarding this
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this is clear now
i got it
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your welcome :D
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