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Equations of straight lines through (x1 ,y1 ) making angle α with y=mx+c

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Equations of straight lines through (x1 ,y1) making angle α with y=mx+c

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y-y1 \(=\cfrac{m+tan\alpha}{1-mta\alpha}(x-x_1)\) and y y1 \(=\cfrac{m-tan\alpha}{1+mtan\alpha}(x-x_1)\)

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