以勒让德多项式<img src="/lqwvjeImg/d5/d51160dd69de561ae218550f0977ded1.png"style="width:40px;height:27px;">为基本函数族,在<img src="/lqwvjeImg/2e/2e24dfdb1f560d0a8e3b57331f60b3b2.png"style="width:41px;height:27px;">上展开函数<img src="/lqwvjeImg/7f/7faa01f91c5b09333e7c55965318ab80.png"style="width:88px;height:34px;">,对应的广义傅里叶级数是: ( )<br>·<img src="/lqwvjeImg/59/594f280305f430a4d91b0ccc91a9fdd4.png"style="width:146px;height:52px;"><br>·<img src="/lqwvjeImg/75/7522892b856d630ef0fe300869a5d0cc.png"style="width:146px;height:52px;"><br>·<img src="/lqwvjeImg/fc/fcb6831cfc0d22432fa97638f0aa0ea2.png"style="width:147px;height:52px;"><br>·<img src="/lqwvjeImg/e0/e026989c42bdfa89b54a8559e29675e5.png"style="width:147px;height:52px;">