函数y=xcos2x在点(π/4,0)处的切线方程是

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函数y=xcos2x在点(π/4,0)处的切线方程是函数y=xcos2x在点(π/4,0)处的切线方程是函数y=xcos2x在点(π/4,0)处的切线方程是y''=cos2x=2xsinxy''i=π/4

函数y=xcos2x在点(π/4,0)处的切线方程是
函数y=xcos2x在点(π/4,0)处的切线方程是

函数y=xcos2x在点(π/4,0)处的切线方程是
y'=cos2x=2xsinx
y'i=π/4=-(根号2)×π/4
4π（根号2）x+16y+π^2(根号2）=0

Y^=COS2X+X(-SIN2X)2