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 \

1.	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.	\[-\cot \alpha \]
Answer» E.

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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

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