已知0<α<β<π2,且cosαcosβ+sinαsinβ=45,tanβ=43,则tanα=____
如图,实线和虚线分别表示等量异种点电荷的电场线和等势线,则下列有关P 、Q两点的相关说法中正确的是( )
He said nothing except ________ he will come to her birthday party.