函数y=sin2x乘以cosx/(1-sinx)的值域是
人气:247 ℃ 时间:2019-09-29 06:07:30
解答
f(x)=sin2xcosx/(1-sinx)=2sinx*(cosx*cosx)/(1-sinx)=2sinx*(1-sinx)*(1+sinx)/(1-sinx)=2sinx*(1+sinx),(sinx不等于1)=2*(sinx+sinx*sinx)=2*[(sinx+1/2)^2-1/4]因为-1
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