Set w(r, y) = cos(xy) where x = t² and y = el-8t, then dw dt Select one: a. -2ysin(xy)t^1+8xsin(xy)e^(1-8t) O b. -2ysin(xy)t^1-8xsin(xy)e^(1-8t) c. -2ysin(xy)t^1+8xcos(xy)e^(1-8t) d. -2ycos(xy)t^1+8xsin(xy)e^(1-8t)

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A: For the relation , to find its first derivative at the point where  .

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Q: Jse the Chain Rule to find and 0z when z = exy sinx,x = 2s and y = s +t as at

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