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Suppose w=x/y+y/z, where
x = e³t, y=2+sin(4t), and z=2+cos(5t).

Use the chain rule to find dw/dt as a function of x, y, z, and t. Do not rewrite x, y, and z in terms of t, and do not rewrite e³t as x.
dwdt =???
Note: You may want to use exp() for the exponential function. Your answer should be an expression in x, y, z, and t; e.g. "3x - 4y"