[工數]一個積分
積分範圍是0~pi
Bn=積分符號[1/pi ( sinx sinnx ] dx
題目是傅立葉章節的例題
我算出Bn=0
但是答案 n=1時Bn=1/2
n=2,3,4,...時Bn=0
請問為什麼?
謝謝
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