在用本征函数法求解下面定解问题时,与齐次边界条件相对应的试探解是: ( )<img src="/lqwvjeImg/6a/6a357e95d0f0b8197631ef36b15f2071.png"style="width:200px;height:96px;"><br>·<img src="/lqwvjeImg/fb/fb3bced2b417c800b6bbc80d2e249b55.png"style="width:209px;height:57px;"><br>·<img src="/lqwvjeImg/83/837cfe9098cfbc86feab9aa2381d8c52.png"style="width:262px;height:59px;"><br>·<img src="/lqwvjeImg/72/72dcf6a6c10fc3166de9cbb95a0d1032.png"style="width:213px;height:57px;"><br>·<img src="/lqwvjeImg/6a/6ae9a6c929c65c06745eb214563b8b34.png"style="width:259px;height:59px;">