tan²A+cot²A+2=sec²A cosec²A
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Posted by Davidson Louriyam 6 years, 11 months ago
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Sukdeb Mukherjee 6 years, 11 months ago
tan2a + cot2a + 2
= sec2a - 1 + cosec2a - 1 + 2
= sec2a - 2+2 + cosec2a
=sec2a + cosec2a
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