求sin^4π/8+cos^4π/8的值
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/06/14 15:12:44
求sin^4π/8+cos^4π/8的值
![求sin^4π/8+cos^4π/8的值](/uploads/image/z/18920200-40-0.jpg?t=%E6%B1%82sin%5E4%CF%80%2F8%2Bcos%5E4%CF%80%2F8%E7%9A%84%E5%80%BC)
=(sin²π/8+cos²π/8)²- 2sin²π/8cos²π/8
=1- (1/2)sin²π/4
=1-1/4=3/4
=1- (1/2)sin²π/4
=1-1/4=3/4
已知tan(π-α)=2,求sinα-2sinαcosα-cosα/4cosα-3sinα的值
已知tan(α+π/4)=3,求cosα+2sinα/cosα-sinα的值
已知tan(π/4+α)=-3,求[2(Sinα)的平方+3SinαCosα]/(Cotα-SinαCosα)的值.
(cos π/8+ sin π/8 ) (cos^3 π/8+sin^3 π/8 )的值.
已知sin[a-b]cos a-cos[b-a]sin a=3/5,b是第三象限角,求sin[b+5π/4]的值
已知sin(α-β)cosα-cos(β-α)sinα=3/5,β是第三象限角,求sin(β+5π/4)的值
求SINπ/64 COSπ/64 COSπ/32 COSπ/16 COSπ/8
已知cosα/8=-4/5,8π<α<12π,求sinα/4,cosα/4,tanα/4的值
sinα-cosα=m 求sin^4α+cos^4α的值
已知sin^4θ+cos^4θ=1,求sinθ+cosθ的值
求sin^4α+cos^2α+sin^2αcos^2α的值
已知θ∈(-π/2,0),cosθ=13,求sinθ+cos(θ-π/4)的值