求极限lim(x→π/4) 1+sin2x/1-cos4x
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求lim(x→π/4) (sin2x-cos2x-1)/(cosx-sinx)的极限
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lim 1-cos4x/2sin^2x+xtan^2x x趋近于0 求极限
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lim(x→0)(1-cos4x)/xsinx
求极限 lim(sin2x/sin3x) x->π
求极限 lim(x→0){x[sin(1/x^2)-1/sin2x]}
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lim x-0 sin2x/x 求极限