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If sec theta + tan theta = k, cos...

If ` sec theta + tan theta = k, cos theta `=

A

`(k^2 +1)/( 2k)`

B

`(2k)/( k^2 +1)`

C

`(k)/( k^2 +1)`

D

`(k)/(k^2 -1)`

Text Solution

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The correct Answer is:
B
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