曲线X=y^4-y (a)求dy/dx (b)当斜率为1/3,求该切线方程.
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曲线X=y^4-y (a)求dy/dx (b)当斜率为1/3,求该切线方程.
曲线X=y^4-y (a)求dy/dx (b)当斜率为1/3,求该切线方程.
曲线X=y^4-y (a)求dy/dx (b)当斜率为1/3,求该切线方程.
(a)
X=y^4-y
dx=4y^3dy-dy
dx=(4y^3-1)dy
dy/dx=1/(4y^3-1)
(b)k=1/3,也即1/(4y^3-1)=1/3
4y^3-1=3
y=1
所以x=1-1=0
切线过(0,1)
y-1=x/3
x-3y+3=0
曲线X=y^4-y (a)求dy/dx (b)当斜率为1/3,求该切线方程.
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