find the evolute of x2=4ay
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The directrix of the parabola x2 = 4ay, having y-axis as its axis, passes through (0, -a), and has the equation y + a = 0. The focus of the parabola x2 = -4ay, having y-axis as its axis, passes through (0, a), and has the equation y - a = 0.
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the parameyric form of parabola
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