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Question

(sin α+cos ecα)2+(cos α+sec α)2(tan2α+cot2α) for all values of α is equal to


A

0

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B

2

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C

4

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D

7

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Solution

The correct option is D

7


sin2A+cos ec2 α+2+cos2 α+sec2 α+2tan2 αcot2α=1+1+cot2α+tan2 α+4tan2 αcot2 α=7


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