作业帮cos (x/2) - sinx=0求x
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cos (x/2) - sinx=0求x
cos (x/2) - sinx=0求x
cos (x/2) - sinx=0求x
sinx=2sin(x/2)cos(x /2)
cos (x/2) = sinx
cos (x/2) = 2sin(x/2)cos(x /2)
sin(x/2) =1/2
x/2=30`
x=60`
x＝兀／3
sinx=2sin(x/2)cos(x /2)
cos (x/2) = sinx
cos (x/2) = 2sin(x/2)cos(x /2)
sin(x/2) =1/2或cos (x/2)=0
x/2=30+k*360,x/2=150+k*360或x/2=90+k*180
x=60+2k*360,x=300+2k*360或x=180+k*360(k∈Z)
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