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Find the slope of the normal to the curve x = acos^3θ, y = asin^3θ at θ= π/4

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Find the slope of the normal to the curve x = acos3θ, y = asin3θ at  θ= π/4

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It is given that x = acos3θ and y = asin3θ.

Therefore, the slope of the tangent at θ=π/4   is given by,

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