그림참조
마지막 적분을 울프램알파로 계산하면
http://www.wolframalpha.com/input/?i=integrate%5B1%2Fsin+x%2C+%7Bx%2C+pi%2F3%2C+2pi%2F3%7D%5D
그림참조
마지막 적분을 울프램알파로 계산하면
http://www.wolframalpha.com/input/?i=integrate%5B1%2Fsin+x%2C+%7Bx%2C+pi%2F3%2C+2pi%2F3%7D%5D
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