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求lim(x→0+) ( 2/π*cosπ/2(1-x))/x的极限
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证明COS(X+Y)COS(X-Y)=COS^2X-SIN^2Y
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求极限x趋于0 y趋于0时,lim(1-cos(x^2+y^2))/(x^2+y^2)
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求下列函数导数y=cos(π/3-x)y=e^3xy=In(3-x)y=cos^3(1-2x)
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dx/dy=x/y+[cos(x/y)]∧2,y(0)=1
不等式,函数和极限1、解不等式|x| +1 > |x-3|2、函数 f(x/y) =f(x)-f(y) ,求f(x)3、