设E2y18向量PE=2y-2sin∠ABC/18=√22/22

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设E2y18向量PE=2y-2sin∠ABC/18=√22/22设E2y18向量PE=2y-2sin∠ABC/18=√22/22设E2y18向量PE=2y-2sin∠ABC/18=√22/22=-26

设E2y18向量PE=2y-2sin∠ABC/18=√22/22
设E2y18向量PE=2y-2sin∠ABC/18=√22/22

设E2y18向量PE=2y-2sin∠ABC/18=√22/22
=-26-1=-111已知x=-1/26两式相减得26ab=b^26