The gradient of the tangent line at the point $(a\cos \alpha ,a\sin \alpha )$ to the circle ${x^2} + {y^2} = {a^2}$, is
The gradient of the tangent line at the point $(a\cos \alpha ,a\sin \alpha )$ to the circle ${x^2} + {y^2} = {a^2}$, is
- A
$\tan \alpha $
- B
$\tan (\pi - \alpha )$
- C
$\cot \alpha $
- D
$ - \cot \alpha $
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