sin2x=sin(x/2) 0
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sin2x=sin(x/2)0sin2x=sin(x/2)0sin2x=sin(x/2)0解由sin2x=sin(x/2)得2x=x/2+2kπ,k属于Z即3x/2=2kπ,k属于Z即x=4/3kπ,
sin2x=sin(x/2) 0
sin2x=sin(x/2)
0
sin2x=sin(x/2) 0
解由sin2x=sin(x/2)
得2x=x/2+2kπ,k属于Z
即3x/2=2kπ,k属于Z
即x=4/3kπ,k属于Z
又由0
显然有2x=x/2或x/2+2x=kπ,而0≤x≤270,所以k=1,故有x=0°或x=72°
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