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Cos15度值等于多少

cos15度=cos(45度-30度)=cos45度cos30度+sin45度sin30度=根号2/2*根号3/2+根号2/2*1/2=(根号6+根号2)/4.

sin15=(√6-√2)/4≈0.6503 cos15°=(√2/4)(√3-1)≈0.9659 详解: sin15=sin(45-30)=sin45cos30-cos45sin30=√2/2*√3/2-√2/2*1/2=(√6-√2)/4≈0.6503 cos15°=cos(45°-30°)=cos45°cos30°+sin45°sin30°.=(√2/2)*(√3/2)+√2/

sin15°=(45°-30°)=sin45°cos30°-cos45°sin30°=(6^0.5-2^0.5)/4=(根号6-根号2)/4cos15度=cos(45度-30度)=cos45度cos30度+sin45度sin30度=根号2/2*根号3/2+根号2/2*1/2=(根号6+根号2)/4.

用余弦定理

cos15°≈0.966.

cos15°的值为(√6+√2)/4,其计算方法为:cos15°=cos(45°-30°)=cos45°cos30°+sin45°sin30°=(√2/2)(√3/2)+(√2/2)(1/2)=(√6+√2)/4.cos为三角函数的一种,称为余弦,它的定义为:角A的邻边比斜边的值称为∠A的余弦,记为“cosA

1.cos(-15°)=cos15°=cos(45°-30°)=cos45°cos30°+sin45°sin30°=√2/2*√3/2+√2/2*1/2=(√6+√2)/4 2.(1)因为f(x)=cos(2x-π/3)+2sin(x-π/4)sin(x+π/4) =cos(2x-π/3)+2sin(x+π/4-π/2)sin(x+π/4)=cos(2x-π/3)-2cos(x+π/4)sin(x+π/4) =cos(2x-π/3)-sin(2x+

cos30°=2cos15°^2-1=√3/2, cos15°=√(√3+2)/4前面那个是大根号

2[cos15°]^2 -1 = cos30°2[cos15°]^2 -1 = √3/2[cos15°]^2 = (2+√3)/4cos15° =(1/2)√(2+√3) =(1/4)(√2+√6)

cos15°=(√6+√2)/4

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