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If sectheta+tantheta=xthen the value of ...

If `sectheta+tantheta=x`then the value of `sectheta`will be

A

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

B

`(x^2+1)/x`

C

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

D

`(x^2-1)/x`

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