选修\(4-1\):几何证明选讲
如图,\(⊙O_{1}\)与\(⊙O_{2}\)相交于\(A\)、\(B\)两点,\(AB\)是\(⊙O_{2}\)的直径,过\(A\)点作\(⊙O_{1}\)的切线交\(⊙O2\)于点\(E\),并与\(BO_{1}\)的延长线交于点\(P\),\(PB\)分别与\(⊙O_{1}\),\(⊙O_{2}\)交于\(C\),\(D\)两点.
\((1)\)求证:\(PA·PD=PE·PC\):
\((2)\)求证:\(AD=AE\).
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