### Example of Chain Rule for Partial Derivatives

Multivariable Calculus: Find del w/del s and del w/del t if w(x, y) = x^2 - y^2, x(s,t) = cos(s+3t) and y(s,t) = sin(s+3t). We verify the answer by using double angle formulae for sine and cosine. For more videos like this one, please visit the Multivariable Calculus playlist at my channel.

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