(a) Let f(x, y) = sin(y?). Compute fry and fyr and show that they are equal to each other. (b) Let line Lı have parametric equations x = -2+ 3t, y = 4t, and z = 8 – t. Let L2 have parametric equations x = 1+ 2s, y = 3 - 5s, and z = 2+ s. Determine whether L1 and L2 are parallel, intersecting, or skew.

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