sin(10°)+sin(50°)-sin(70°) =sin(10°)+sin(50°)-sin(70°) =

sin(10°)+sin(50°)-sin(70°) =sin(10°)+sin(50°)-sin(70°) = 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°= 求sin²10°+sin²20°+sin²40°+sin²50°+sin²70°+sin²80° sin(10°)+sin(20°)cos(50°)求值 sin的平方10°+sin的平方80° 计算:sin²10°+sin²20°+sin²30°+.sin²80°= 计算:sin²10°+sin²20°+sin²30°+……sin²80°= sin²10°+sin²20°+sin²30°+……+sin²80°=? 求sin平方10°+sin平方20°+.+sin平方80°的值 sin^2 10°+ sin^2 50°+ sin10°sin50°计算 , sin²10°＋sin²50°＋sin10°sin50°= sin²10°+sin²20°+sin²30°+……+sin²80°+sin²90°=? sin（-1300°）等于多少?sin(-1300)=-sin(1300)=-sin(360*4-140)=-sin(-140)=sin(140)=sin(90+50)=cos50 这个是我的计算步骤 有错吗 在哪里 请指教 1.Sin（-10π/3）2.cos29π/63.tan（-855°）----------------------------- 4.√（1-2sin1085°*sin（-2075°）------------------------------------------------- Cos5°-√（1-sin²95°）那是个根号***除以（***减根号***）√（1-2si 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