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If x = 3 tant and y = 3sect, then the value of d^2y/dx^2 at t = π/4 is :

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If x = 3 tant and y = 3sect, then the value of d2y/dx2 at t = π/4 is :

(1) 1/3√2

(2) 1/6√2

(3) 3/2√2

(4) 1/6

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The correct option (2) 1/6√2   

Explanation:

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