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If underset (xrarr0)"lim"(cos+asinbx)^(x...

If `underset (xrarr0)"lim"(cos+asinbx)^(x/y)=e^(2)` then the values of a and b are

A

a =1 , b = -2

B

`a = 2sqrt2, b = sqrt2`

C

`a=2sqrt2 , b = 1/ sqrt2`

D

a= -2 , b = 1

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The correct Answer is:
C
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