Test Academy | If x = a cos⁴ θ, y = a sin⁴ θ. then dy/dx at θ = 3π/4 is -1, 1, -a², a²

Question

If x = a cos⁴ θ, y = a sin⁴ θ. then dy/dx at θ = 3π/4 is

Options :

-1
1
-a²
a²

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