A) \[4\cos \alpha \cos \text{e}{{\text{c}}^{2}}\alpha \]
B) \[4\tan \alpha \sec \alpha \]
C) \[4\sin \alpha {{\sec }^{2}}\alpha \]
D) None of these
Correct Answer: A
Solution :
Let \[A\] be the vertex of the parabola and \[AP\] is chord of parabola such that slope of \[AP\] is\[\cot \alpha \].You need to login to perform this action.
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