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(几何证明选讲选做题)如图,AB为⊙O的直径,弦AC、BD相交于点P,若AB=3,CD=1,则cos∠BPC的值为______
(几何证明选讲选做题)如图,AB为⊙O的直径,弦AC、BD相交于点P,若AB=3,CD=1,则cos∠BPC的值为______....
(几何证明选讲选做题)如图,AB为⊙O的直径,弦AC、BD相交于点P,若AB=3,CD=1,则cos∠BPC的值为______.
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