If the line ycosalpha=xsinalpha+acosalph...

If the line `ycosalpha=xsinalpha+acosalpha` be a tangent to the circle `x^2+y^2=a^2`, then

A

`sin^2alpha=1`

B

`cos^2alpha=1`

C

`sin^2alpha=a^2`

D

`cos^2alpha=a^2`

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