计算极限 lim(sin3x/sin5x) x趋近于0 lim[2x²/(1-cosx)]x趋近于0

问题描述:

计算极限 lim(sin3x/sin5x) x趋近于0 lim[2x²/(1-cosx)]x趋近于0
文科····

lim(sin3x/sin5x) x趋近于0
=lim3/5(5xsin3x/3xsin5x) x趋近于0
=3/5
lim[2x²/(1-cosx)]x趋近于0
=lim[2x²/(2sin^x)]x趋近于0
=1