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Multivariable chain rule

Problem

Let f, left parenthesis, x, comma, y, right parenthesis, equals, natural log, left parenthesis, x, squared, right parenthesis, plus, y and g, left parenthesis, t, right parenthesis, equals, left parenthesis, sine, left parenthesis, t, right parenthesis, comma, minus, cosine, left parenthesis, t, right parenthesis, right parenthesis.
h, left parenthesis, t, right parenthesis, equals, f, left parenthesis, g, left parenthesis, t, right parenthesis, right parenthesis
h, prime, left parenthesis, t, right parenthesis, equals
Stuck?
Stuck?