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sin75度等于多少少

Sin75度=sin(45度+30度) =sin45度cos30度+cos45度sin30度 =√2/2 * √3/2 + √2/2 * 1/2 =√2/2 *[(√3 + 1)/2] =(√6 + √2)/4

sin75°=sin(45°+30°)=sin45°cos30°+sin30°cos45°=( √6+√2)/4 满意请采纳

sin75度 = sin(45度+30度)= 2^(1/2) / 2 * 3^(1/2)/2 + 2^(1/2) * 1/2 = (6^(1/2) + 2^(1/2))/4

sin75°=sin(30°+45°)=sin30°cos45°+cos30°sin45°=(√6+√2)/4

sin75=sin(60+15)cos30=1-2(sin15)^2,这个二倍角公式,知道sin15,就知道cos15,或者sin75=sin(45+30),这个就更简单了,或者cos150=1-2(sin75)^2, so many sin75=0.9397

sin75°=sin(45°+30°)=sin45°*cos30°+cos45°*sin30°=√2/2*√3/2+√2/2*1/2=√6/4+√2/4=(√2+√6)/4

sin75°=sin(45°+30°)=sin45°cos30°+cos45°sin30°=(√6+√2)/4 cos75=cos(30+45)=cos30cos45-sin30sin45=√6/4-√2/4=(√6-√2)/4 sin75+cos75=sin75+sin15=2sin(75+15)/2cos(75-15)/2=2sin45cos30=√6/2 sin75-cos75=sin75-sin15=2cos(

cos75度=0.258819;sin75度=0.965926

sin75=sin(45+30)=sin45cos30+sin30cos45 cos75=cos(45+30)=cos45cos30-sin45sin30

sin75°=sin(30°+45°)=1/2 x √2/2 +√3/2 x √2/2= (√2+√6)/4在我回答的右上角点击【评价】,然后就可以选择【满意,问题已经完美解决】了.

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