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Let z1 = 5-i and z2 = -5+3i be complex numbers. Find z1-z2 z1z2 z1/(2z1+z2) Let z = z1+z2. Find the magnitude of z and the principal argument of z and use these values to find exact values for the square roots of z. Let f1 be the line having parametric equations x=1+3s, y=2-s, z=-1+2s and l2 be the line having parametric equations x=8+t, y=-5+2t, z=7-t. By finding the point of intersection, show that l1 and l2 intersect. Find the cosine of the angle between the lines at the point of intersection. Let f(x, y) = 6 rootx2+y+4. Find the first partial derivatives of f. Find the equation of the tangent plane to the surface defined by f at the point (2, 1) in the domain of f. Use a linear approximation to estimate the value of f(-2.94, 3.04). The following results may be helpful: