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The gradient of the tangent line at the ...

The gradient of the tangent line at the point `(a cos alpha, a sin alpha)` to the circle `x^2 + y^2 = a^2`

A

`tan alpha`

B

`tan (pi- alpha)`

C

`cot alpha`

D

`-cot alpha`

Text Solution

Verified by Experts

The correct Answer is:
D
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