Question 1 A function z(x, y) of x and y is given by the formula z = r² sin(30), where r and 0 are the usual polar coordinates. Starting at the point corresponding to r = 3 and 0 = π/3, the corresponding x and y values are changed by adding .1 to x and adding .15 to y. If A is the estimated change in z obtained from the linear approximation applied to z(x, y), then the value of sin(3A) is -0.172 -0.869 0.725 -0.420 0.424 -0.788 0.308 0.160 1 pts

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