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If tanalpha+secalpha=e^x,then cosalpha e...

If `tanalpha+secalpha=e^x`,then `cosalpha` equals

A

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

B

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

C

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

D

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

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