已知两条不同的直线、及平面,给出四个下列命题:(1)若,,则;(2)若,,则;(3)若、与所成的角相等,则;(4)若,,则.其中正确的命题有( )
已知函数则函数的反函数是
Suppose the least distance fron poinrs of the xurve(曲线)to the y-axis is then the velue of a is
当x.yi满足条件时,变量U=的取值范围是
Ahyperbola(双曲线)wjthvertices(顶点)(-2,5)and(-2,-3),has an asynptote(渐近线)that passes the point(2.5) Then an equarionk of the hyperbola is
函数的最小值是