sin 55°22 '30"° sin 19°9 ' 求三角函数值,实验数据要用的务必精确,

计算:sin方10°+sin方20°+sin方30°+sin方40°+sin方50°+sin方60°+sin方70°+sin方80°+sin方90°= 化简sin^(a-30°)+sin^(a+30°)-sin^a化简sin^2(a-30°)+sin^2(a+30°)-sin^2a sin(α+30°)-sin(α-30°)/cosα sin(30°+x)-sin(30°-x)等于多少? sin(30°+β)-sin(30°-β)化简 sin 55°22 '30° sin 19°9 ' 求三角函数值,实验数据要用的务必精确, 计算:sin²10°+sin²20°+sin²30°+.sin²80°= 计算:sin²10°+sin²20°+sin²30°+……sin²80°= sin²10°+sin²20°+sin²30°+……+sin²80°=? sin(10°)+sin(50°)-sin(70°) =sin(10°)+sin(50°)-sin(70°) = sin²10°+sin²20°+sin²30°+……+sin²80°+sin²90°=? sin(18°)sin(54°)sin(18°)*sin(54°) 不用计算器 sin?°≈0.6773? sin 15°是多少 sin²1°+sin²2°+sin²3°+.+sin²89 sin sin 化简:sin^A*sin^A+sin(A-60°)*sin(A-60°)+sin(A+60°)*