cot²A×sec²A=cot²A+1
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cot²A×sec²A = cot²A+1
L.H.S:
cot²A×sec²A = cot²A×(1+tan²A)
= cot²A + cot²Atan²A
= cot²A + (cot²A × 1/cot²A)
= cot²A + 1
= R.H.S
Hence proved.
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