1
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Question

If tan2A=2tan2B+1; then which of the following can be the possible values of cos2A+sin2B ?

A

- 2

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B

1

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C

2

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D

- 1

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Solution

The correct option is B 1 Since both the terms in the find'' entry are in squares, so the answer cannot be - 1. Again it cannot be 0 also because for that both the terms should be zero as none can be negative for both the terms to be 0. Again the answer cannot be 2 also because then both the terms in find entry should be 1 as it will make tan 90∘ which is undefined. So the possible value can be 1 only.

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