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15度和75度角的sin,Cos,tAn值?

sin15°=cos75°=(√6-√2)/4 cos15°=sin75°=(√6+√2)/4 tan15°=cot75°=(√6-√2)/(√6+√2)=(√6-√2)^2/4=2-√3 tan75°=cot15°=(√6+√2)/(√6-√2)=(√6+√2)^2/4=2+√3

根号下BC的平方加上AC的平方等于AB sin15=BC/AB cos15=AC/AB tan15=BC/AC sin75=AC/AB cos75=BC/AB tan75=AC/BC

因为sin15°= sin(45° - 30°) = sin45°cos30° - cos45°sin30 °= √2/2×√3/2 - √2/2×1/2= (√6 - √2)/4cos15 °= cos(45 °- 30°) = cos45°cos30 °+ sin45°sin30° = √2/2×√3/2 + √2/2×1/2 = (√6+√2)/4tan15°=sin15°/cos15°= (√6 - √2)/ (√6 +√2)=2-√3 ...

sin15=(根号6-根号2)/4 cos15=(根号2+根号6)÷4 tan15=2-根号3sin30=0.5 cos30=根号3/2 tan30=根号3sin45=根号2/2 cos45=根号2/2 tan45=1 sin60=根号3/2 cos60=0.5 tan60=根号3sin75=(根号2+根号6)÷4 cos75=(根号6-根号2)/4 tan75=2+根号3sin90=1...

等于。

变成sin(45+30)展开算

sin(15°) =sin(45°-30°) =sin45°cos30°-cos45°sin30° =√2/2*√3/2-√2/2*1/2 =(√6-√2)/4 cos15° =sin(75°) =sin(45°+30°) =sin45°cos30°+cos45°sin30° =√2/2*√3/2+√2/2*1/2 =(√6+√2)/4 tan15° =sin15°/cos15° =(√6-√2)/(√6+√2) =2...

sin15=sin(60-45)=sin60cos45-cos60sin45=(根号6 可以设∠A=∠B+∠C sinA=sin(B+C)=sinBcosC+cosBsinC cosA=cos(B+C)=cosBcosC-sinBsinC tanA=tan(B+C)=(tanB+tanC)/(1-tanBtanC) 角度0° 30° 45° 60° 90° sin 0 1/2 √2/2 √3/2 1 cos 1 √3/2...

cos75=sin15 ,sin255=sin(360-105), 由正弦函数周期性的sin(360-105)=-sin105=-sin(90+15)=-cos15 原式为sin15cos15+cos15sin15=2sin15cos15=sin30=1 /2

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(75+15)/2sin(75-1...

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