求极限:
limx→0x0(√(1+t2)-√(1-t2))/x3
求极限:
limx→0x0(√(1+t2)-√(1-t2))/x3
【正确答案】:limx→0x0[√(1+t2)-√(1-t2)]dt/x3 =limx→0 (√(1+x2) -√(1-x2)) /3x2 =limx→0[2x/2√(1+x2)-(-2x)/2√ (1-x2)]/6x =limx→0[1/6√(1+x2)+1/6√(1-x2)] =1/3
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