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- Does the sphere x2+y2+z2=100 have symmetry with respect to the a x-axis? b xy-plane?Find the slope of the tangent line at the point (1,−2,−3) on the curve of intersection of the surface z = 5−4x² −y² with (a) the plane x = 1 (b) the plane y = −2.Find the equation of tangent plane to the surface x^2 + 2y^2 + 3z^2 = 21 which is parallel to the plane 2x + 4y + 6z = 3.