sin105°=?sin75°=?sin15°=?
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/06/01 13:06:19
sin105°=?sin75°=?sin15°=?
sin105°
= sin(45°+60°)
= sin45°cos60°+cos45°sin60°
= √2/2*½+√2/2*√3/2
= √2/4+√6/4
= (√2+√6)/4
sin75°
= sin(45°+30°)
= sin45°cos30°+cos45°sin30°
= √2/2*√3/2+√2/2*½
= (√2+√6)/4
sin15°
= sin(45°-30°)
= sin45°cos30°-cos45°sin30°
= √2/2*√3/2-√2/2*½
=(√6-√2)/4
= sin(45°+60°)
= sin45°cos60°+cos45°sin60°
= √2/2*½+√2/2*√3/2
= √2/4+√6/4
= (√2+√6)/4
sin75°
= sin(45°+30°)
= sin45°cos30°+cos45°sin30°
= √2/2*√3/2+√2/2*½
= (√2+√6)/4
sin15°
= sin(45°-30°)
= sin45°cos30°-cos45°sin30°
= √2/2*√3/2-√2/2*½
=(√6-√2)/4
(cos15°-cos75°)(sin75°+sin15°)=?
sin15°乘sin75°
sin15°sin75°=?
sin15°+sin75°=?
sin15°,sin75°,sin105°,cos15°,cos75°,cos105°用公式算值为多少
求sin15°×sin75°的值
sin105度等于sin105°等于多少
tan15°、tan75°sin15°、sin75°、cos15°cos75°具体数值
(cos15°-cos75°)(sin75°+sin15°)怎么化简?
cos75°cos15°+sin75°sin15°的值为( )
sin105°怎么算
sin105度= sin15度= sin75度= 怎么求,