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Question

(tan2 A sec2 Bsec2 A tan2 B)=_____.

A
(tan2 Atan2 B)
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B
(tan2 A+tan2 B)
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C
(tan2 A1tan2 B)
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D
(tan2 A+1tan2 B)
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Solution

The correct option is A (tan2 Atan2 B)
=(tan2A.sec2 Bsec2A.tan2B)

=tan2A.(1+tan2B)(1+tan2A).tan2B
(sec2θtan2θ=1)

=tan2A+tan2A.tan2Btan2Btan2A.tan2B

=(tan2Atan2B)

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