GPT-5.4 Thinking
如图,在四棱锥${P-A B C D}$中,${A B \perp}$平面${P A D, A D ...
如图,在四棱锥${P-A B C D}$中,${A B \perp}$平面${P A D, A D / / B C, A B=B C=A P=\frac{1}{2} A D=1, P D \perp A P, \angle A D P=30{\circ}}$,${E}$是${P D}$的中点。点${M}$在线段${P C}$(不含端点)上,且异面直线${B M}$与${C E}$所成角的余弦值为$...