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If t a ntheta+s e ctheta, then costheta ...

If `t a ntheta+s e ctheta,` then `costheta` equals `(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))`

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

Verified by Experts

The correct Answer is:
B
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