Question

Let z = cos (- (5y2 + 2x) ). Then a) The rate of change in...

Let z = cos (- (5y2 + 2x) ). Then

a) The rate of change in z at (-1,-1) as we change x but hold y fixed is ___

and

b) The rate of change in z at (-1, -1) as we change y but hold x fixed is ____.

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