已知勒让德多项式的递推关系为<img src="/lqwvjeImg/21/21468b6393000df6ef1e569113d1349c.png"style="width:346px;height:34px;">,<img src="/lqwvjeImg/b7/b7b9ff3c81de0ec435ecb61a33d02aac.png"style="width:160px;height:34px;">,则<img src="/lqwvjeImg/79/7972eca6f59e647031b1f94dcccbade0.png"style="width:68px;height:34px;">( )<br>·<img src="/lqwvjeImg/3d/3d3acb351bff4648b955a226361010fe.png"style="width:23px;height:28px;"><br>·<img src="/lqwvjeImg/6a/6af97bfe9c185d84224e9c8fb2429242.png"style="width:60px;height:28px;"><br>·<img src="/lqwvjeImg/55/551ef42fff10ff34809119dce7b4841b.png"style="width:88px;height:53px;"><br>·<img src="/lqwvjeImg/60/60b7d30d0a4e1ff65a944f7ab8b270fe.png"style="width:88px;height:53px;">