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y″-2y′-3y=0 y″+2y′-3y=0 y″-3y′+2y=0 y″+2y′+y=0
y=(Ax2+Bx)ex y=(Ax+ex y=Ax2ex y=Axex
y=2ex-xex y=cx-xex x=2ey-yey x=cy-yey
y″-2y′-3y=0 y″+2y′-3y=0 y″-3y′+2y=0 y″+3y′-2y=0
cosy=(1+ex) cosy=(1+ex) cosy=4(1+ex) cos2y=(1+ex)
cosy=(1+ex)/4 cosy=1+ex cosy=4(1+ex) cos2y=1+ex
y"'-y"-y'-y=0. y"'+y"-y'-y=0. y"'-6y"+11y'-6y=0. y"'-2y"-3y'+2y=0.
y"'-y"-y'+y=0 y"'+y"-y'-y=0 y'"-6y"+11y'-6y=0 y"'-2y"-y'+2y=0
y″-2y′-3y=0 y″+2y′-3y=0 y″-3y′+2y=0 y″+2y′+y=0
2ex+y+e=0 2ex﹣y﹣e=0 2ex+y﹣3e=0 2ex﹣y+3e=0
y=(Ax2+Bx)ex y=(Ax+ex y=A2ex y=Axex
y′=2x+ln(ex) y′=x+ln(ex2) y′=xln(ex2) y′=2xln(ex2)
y'"-y"-y'+y=0. y'"+y"-y'-y=0. y'"-6y"+11y'-6y=0. y'"-2y"-y'+2y=0.