共50条信息
四棱锥\(P-ABCD\)中,\(PA\bot \)平面\(ABCD\),底面\(ABCD\)是边长为\(2\)的正方形,\(PA=\sqrt{5}\),\(E\)为\(PC\)的中点,则异面直线\(BE\)与\(PD\)所成角的余弦值为\((\) \()\)
如图,在空间直角坐标系中有直三棱柱\(ABC-{{A}^{{{{"}}}}}{{B}^{{{{"}}}}}{{C}^{{{{"}}}}}\),\(CA=C{{C}_{1}}{=}2CB\),则直线\(B{{C}_{1}}\)与 直线\(A{{B}_{1}}\)夹角的余弦值为
长方体\(ABCD-A_{1}B_{1}C_{1}D_{1}\)中\(AB=AA_{1}=2\),\(AD=1\),\(E\)为\(CC_{1}\)的中点且\(AE= \sqrt{6} \),则异面直线\(BC_{1}\)与\(AE\)所成角的余弦值为\((\) \()\)
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