a) Find the equation of the circle with centre at (-2, 1) and passing through the origin.
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Answer: We will learn how to form the equation of a circle passes through the origin. The equation of a circle with centre at (h, k) and radius equal to a, is (x - h)2 + (y - k)2 = a2. We clearly see that the equations (1) and (2) are satisfied by (0, 0). ...
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