如图,在四棱锥\(P-ABCD\)中,侧面\(PAD⊥\)底面\(ABCD\),底面\(ABCD\)是平行四边形,\(∠ABC=45^{\circ}\),\(AD=AP=2\),\(AB=DP=2\sqrt{2}\),\(E\)为\(CD\)的中点,点\(F\)在线段\(PB\)上.
\((1)\)求证:\(AD⊥PC\);
\((2)\)当三棱锥\(B-EFC\)的体积等于四棱锥\(P-ABCD\)体积的\(\dfrac{1}{6}\)时,求\(\dfrac{PF}{PB}\)的值.
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