lim(x趋向0)(1-cos2x)/xsinx怎么解?
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lim(x趋向0)(1-cos2x)/xsinx怎么解?
lim(x趋向0)(1-cos2x)/xsinx怎么解?
lim(x趋向0)(1-cos2x)/xsinx怎么解?
lim(x趋向0)(1-cos2x)/xsinx
=lim(x趋向0)[(1-1+2Sin^2(x)] /xsinx
=lim(x趋向0)2sin^2x/xsinx
=lim(x趋向0)2sinx/x
=2
lim(x趋向0) 1-cos2x/xsinx
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