1. lim(1-2sinX)/(X-兀/6) X趋近于兀/6
2. lim(sinX^3)tanX/(1-cosX^2) X趋近于0
1. lim(1-2sinX)/(X-兀/6) X趋近于兀/6
2. lim(sinX^3)tanX/(1-cosX^2) X趋近于0
1、求导得=lim[-2cos(兀/6)]=根号3
2、化简得=limsinx ^2/cosx=0
1 .用罗比达法则,其值为-√3
2. 2
x→π/6时: 1.lim(1-2sinx)/sin(x-π/6) = lim 2[sin(π/6)-sinx]/sin(x-π/6) = lim 4[cos(π/12+x/2)sin(π/12-x/2)]/[2sin(x/2-π/12)cos(x/2-π/12)] = -lim 2[cos(π/12+x/2)]/cos(x/2-π/12) = - 2cos(π/6)/cos0 = -√3
2.你那个cosX^2是x平方,还是cosx整个的平方