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If tantheta+sectheta=e^x then costheta e...

If `tantheta+sectheta=e^x` then `costheta` equals

A

`(e^x+e^(-x))/2`

B

`2/(e^x+e^(-x)`

C

`(e^x-e^(-x))/2`

D

`(e^x-e^(-x))/(e^x+e(-x))`

Text Solution

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The correct Answer is:
B
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PATHFINDER-TRIGONOMETRIC RATIOS AND IDENTITIES-QUESTION BANK
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  7. If sintheta+cosectheta=2 then sin^ntheta+cosec^ntheta=

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  12. If A=sin^2theta+cos^4theta then for all real values of theta

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