13. F(x)={kcosx/-2x ,x/2

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1 : x^{2} - 3 x^{2} y^{2} + x^{2} y^{2} - 2 x^{2} - 3 y^{2} + 12 x^{2} y^{2}

2 : (x^{2} - 2 x^{2}) + (- 3 x^{2} y^{2} + x^{2} y^{2} + 12 x^{2} y^{2}) - 3 y^{2}

3 : (- x^{2} + 10 x^{2} y^{2} - 3 y^{2})

x^{2} (1 - 3 y^{2}) + (x y^{2} - 2 x) - 3 y (y - 4 x^{2} y)

x^{2} y^{2} - 2 x + y^{2} = 0, 2 x^{2} - 4 x + 3 + y^{3} = 0

x = tan (\frac{1}{a} log y) p r o v e : (1 + x^{2}) y_{2} + (2 x - a) y_{1} = 0

log y = t a n^{- 1} x

(1 + x^{2}) y_{2} + (2 x - 1) y_{1} =

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