maths sir damon reiny or steve help!steve see

Given u(x, y) = x^2 + 2y where x (r, t) = r sin(t) and y(r,t) = sin^2(t), determine the value of ∂u / ∂r and ∂u / ∂t using the chain rule.

Plz show step

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  1. surely you know about the chain rule.

    ∂u/∂r = ∂u/∂x ∂x/∂r + ∂u/∂y ∂y/∂r
    = 2x sin(t) + 2*0
    = 2x sin(t)

    similarly for ∂u/∂t

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  2. still dunno

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