if sinQ = cosQ, then the value of tan²Q + cot²Q is
(a) 2
(b) 4
(c) 1
(d) 10/3
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Answer:
Given tan A+cot A=2
Squaring on both sides we get,
tan2A+cot2A+2tanAcotA=4tan2A+cot2A+2=4tan2A+cot2A=2
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