Sin75°/Cos75°+Cos75°/Sin15°=?
来源:学生作业帮助网 编辑:作业帮 时间:2024/05/27 10:10:08
Sin75°/Cos75°+Cos75°/Sin15°=?
Sin75°/Cos75°+Cos75°/Sin15°=?
Sin75°/Cos75°+Cos75°/Sin15°=?
Sin75°/Cos75°+Cos75°/Sin15°
= sin(45°+30°) / cos(45°+ 30 °) + 1 .Cos75°与 Sin15°相等
= (sin45°cos30°+ cos45°sin30°) / (cos45°cos30°- sin45°sin30°) + 1
= (√2/2 * √3/2 + √2/2 * 1/2 ) / (√2/2 * √3/2 - √2/2 * 1/2 ) + 1
= (√6/4 + √2/4 ) / (√6/4 - √2/4) + 1
= (√6 + √2 ) / (√6 - √2) + 1
= (√6 + √2 )^2 / (√6 - √2)(√6 + √2 ) + 1
= ( 6 + 2 √6√2 + 2) / ( 6 - 2 ) + 1
= (8 + 4√3) / 4 + 1
= 3 + √3
3+3^0.5
Sin75°/Cos75°+Cos75°/Sin15°=tan(45+30)+cos(45+30)/sin(45-30)
再展开算就行了
cos75°-sin75°除以 cos75°+ sin75°
(cos75°+sin75°)(cos75°-sin75°)
求值:(sin75°-cos75°)/(sin75°+cos75°)
Sin75°/Cos75°+Cos75°/Sin15°=?
Sin75°/Cos75°+Cos75°/Sin15°=?
计算,sin75°*cos75°=
(sin75°-cos75°)分之(sin75°+cos75°)我要具体步骤 在线等
计算:(cos75°+sin75°)乘(cos75°-sin75°)=
化简:sin75°cos75°是sin75°乘cos75°
(cos15°-cos75°)(sin75°+sin15°)=?
sin15°cos75°+cos15°sin75°
sin15°cos75°+cos165°sin75°
根2/2(cos75°+sin75°)的值为
tan15°、tan75°sin15°、sin75°、cos15°cos75°具体数值
(sin55°+cos75°sin20°)/(cos55°-sin75°sin20°)求值
化简:cos83°+sin75°sin8°/cos7°-cos75°cos82°
化简 cos15°cos45°-cos75°sin45° cos15°能否化成sin75°?
(cos15°-cos75°)(sin75°+sin15°)怎么化简?