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Question

Which of the following options is/are equal to tan2A+cot2A+2 ?


A

1cos2A sin2A

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B

sec2A cosec2A

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C

tan2Acot2A

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D

sec2A+cosec2A

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Solution

The correct options are
A

1cos2A sin2A


B

sec2A cosec2A


D

sec2A+cosec2A


tan2A+cot2A+2 can be written as (1+tan2A)+(1+cot2A)

We know that, 1+tan2A=sec2A and 1+cot2A=cosec2A

tan2A+cot2A+2=sec2A+cosec2A

=1cos2A+1sin2A

=sin2A+cos2Acos2A sin2A...(sin2A+cos2A=1)

=1cos2A sin2A

=sec2A cosec2A


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