1. (a) Find an equation of the sphere that passes through the point (6, -2, 3) and has center (-1, 2, 1). 3ad10 (b) Find the curve in which this sphere intersects the yz-plane. (c) Find the center and radius of the sphere boy ob word F x² + y² + z² - 8x + 2y + 6z + 1 = 0 obwoll St

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