5.
椭圆\( \dfrac {x^{2}}{a^{2}}+ \dfrac {y^{2}}{b^{2}}=1(a > b > 0)\)在其上一点\(P(x_{0},y_{0})\)处的切线方程为\( \dfrac {x_{0}x}{a^{2}}+ \dfrac {y_{0}y}{b^{2}}=1.\)类比上述结论,双曲线\( \dfrac {x^{2}}{a^{2}}- \dfrac {y^{2}}{b^{2}}=1(a > 0,b > 0)\)在其上一点\(P(x_{0},y_{0})\)处的切线方程为 ______ .