sin(45`+30`)=sin75`=根号2/2(1/2+根号360问答3/2)
sin(74`)=sin(37`+37`)=2sin37`*cos37`=2*0.6*0.8=0.96
cos(45`+30体占虽福神伯欢烧教矛`)=cos75`=根号2/2(根号3/2-1/2)
cos(74`)=1-2sin37`^2=1-0.72=0.28
si市n(75`-74`)=sin1`=根际村脸部轮式早期号2/2(1/2+根号3交山侵去打处急认持/2)*0.28-根号2/2(根号3/2-1/2)*0.钟96
sin3`=4sin1`^2-3sin1`=4*[根号2/2(1/2+根号3/2)*0.28-根号2/2(位根号3/2-1/2)*0.96]-3[根号2/2(1/2+根号3/2)*0.28-根号2/2(根号3/2-1/2)*0.轴战脚输航型源措染每阶96]
标签：sin
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