推 logarithmic:感謝 iyenn大.....Orz 感謝!!......XD 01/19 22:27
推 QQkimi: m(_ _)m 01/19 22:29
※ 引述《logarithmic (對數人)》之銘言：
: solve the differential equation X^3 y'=sec(y),y(1)=π/6
: 拜託板上各位大大,感謝大家!
dy dx
--- =---
secy x^3
siny=-(1/2)x^-2+c
sin(pi/6)=-1/2+c
c=1
->sin(y)=-(1/2)x^-2+1
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為者常成.行者常至
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