y=2-0.5x²与y=0.25x³-2交点(2,0)
y=2-0.5x²的导数:y’=-x 过点(2,0)的切线斜率=-2
y=0.25x³-2的导数:y’=0.75x² 过点(2,0)的切线斜率=3
夹角=arctan|(3+2)/(1-6)|=π/4
y=2-0.5x²与y=0.25x³-2交点(2,0)
y=2-0.5x²的导数:y’=-x 过点(2,0)的切线斜率=-2
y=0.25x³-2的导数:y’=0.75x² 过点(2,0)的切线斜率=3
夹角=arctan|(3+2)/(1-6)|=π/4