sin105°等于多少

沈玲芝3301sin105等于几分之几? -
屠诞冒15375123220 ______[答案] sin105°=sin75°=(√6+√2)/4

沈玲芝3301sin105°= -
屠诞冒15375123220 ______ sin105=sin(60+45)=sin60cos45+cos60sin45=(√6+√2)/4

沈玲芝3301sin105度等于多少 -
屠诞冒15375123220 ______ sin105°=sin75°=sin(30°+45°) 然后拆开后可得答案.有异议欢迎追问~ 无异议记得采纳~

沈玲芝3301sin105度怎么求? -
屠诞冒15375123220 ______ sin105度等于(√6+√2)/4. 解:sin105°=sin(60°+45°) =sin60°cos45°+cos60°sin45° =√3/2*√2/2+1/2*√2/2 =√6/4+√2/4 =(√6+√2)/4 即sin105°等于(√6+√2)/4. 扩展资料: 1、三角函数二角和差公式 (1)sin(A+B)=sinAcosB+...

沈玲芝3301sin105° -
屠诞冒15375123220 ______[答案] sin105=sin(60+45) =sin60cos45+cos60sin45 =根号3/2*根号2/2+1/2*根号2/2 =(根号6+根号2)/4

沈玲芝3301sina 105度等于多少 -
屠诞冒15375123220 ______[答案] 15度角在从前是要记的:分子是√6与√2 的组合, 分母为4,靠近 1的记为较大的,靠近 0记为较小的, 规则是较大的取+号,较小的取-号,如 sin105=(√6+√2)/4 sin15=(√6-√2)/4 cos75=(√6-√2)/4 cos255= - (√6-√2)/4(它rdr0p靠近0,且是负...

沈玲芝3301sin105度= sin15度= sin75度= 怎么求, -
屠诞冒15375123220 ______[答案] sin105=sin(60+45) =sin60cos45+cos60sin45 =(√6+√2)/4 sin15=sin(60-45) =sin60cos45-cos60sin45 =(√6-√2)/4 sin75=sin(π-105)=sin105=(√6+√2)/4

沈玲芝3301sin15°sin105°等于?sin15°sin105°=(过程啊) -
屠诞冒15375123220 ______[答案] sin15°sin105° =sin15°sin(90°+15°)←使用诱导公式 =sin15°cos15° =0.5*(2sin15°cos15°)←使用二倍角公式 =0.5*sin30° ... (sin45°cos60°+cos45°sin60°) =(√2/2*√3/2-√2/2*0.5)(√2/2*0.5+√2/2*√3/2) =(√6/4-√2/4)(√6/4+√2/4) =6/16-2/16 =4/...

沈玲芝3301sin105度怎么算啊 -
屠诞冒15375123220 ______ sin105° = sin(60°+45°) = sin60° * cos45° + cos60° * sin45° = √3/2 * √2/2 + 1/2 * √2/2 = (√6 + √2)/4

沈玲芝3301sin105°cos105°的值为______. -
屠诞冒15375123220 ______[答案] sin105°cos105° =sin(60°+45°)cos(60°+45°) =(sin60°cos45°+cos60°sin45°)(cos60°cos45°-sin60°sin45°) =( 3 2* 2 2+ 1 2* 2 2)( 1 2* 2 2- 3 2* 2 2)=- 1 4 故答案为- 1 4.