[sin^2(x/2)]*[cos^2(x/2)]
=[sin(x/2)cos(x/2)]^2
=[(1/2)*2*sin(x/2)cos(x/2)]^2
=[(1/2)sinx]^2
=(1/4)(sinx)^2
sin^2(x/2)]*[cos^2(x/2)]等于多少啊
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