If the line y cos alpha = x sin alpha +...

If the line ` y cos alpha = x sin alpha +a cos alpha ` be a tangent to the circle `x^(2)+y^(2)=a^(2)`, then

A

`sin^(2) alpha=1`

B

`cos^(2) alpha=1`

C

`sin^(2) alpha= a^(2)`

D

`cos^(2) alpha= a^(2)`

Verified by Experts

The correct Answer is:

B

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