sin^2 10°+ sin^2 50°+ sin10°sin50°计算 ,

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sin^2 10°+ sin^2 50°+ sin10°sin50°计算 ,
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sin^2 10°+ sin^2 50°+ sin10°sin50°计算 ,
sin^2 10°+ sin^2 50°+ sin10°sin50°
计算 ,

sin^2 10°+ sin^2 50°+ sin10°sin50°计算 ,
3/4.
sin^2 10°+ sin^2 50°+ sin10°sin50°
=（1-cos20）/2+（1-cos100)/2+(cos40-cos60)/2
=(2-cos20-cos60+cos100+cos40)/2
=(2-cos20-cos60+2cos60cos20)/2
=(2-cos20-cos60+cos20)/2
=(2-1/2)/2
=3/4

sin^2 10°+ sin^2 50°+ sin10°sin50°
=(sin10+sin50)^2
=(sin10+sin(60-10))^2
=(1/2sin10+根号3/2cos10)^2
=sin(10+60)^2
=(1-cos140)/2
=(1+cos40)/2

sin(10°)+sin(50°)-sin(70°) =sin(10°)+sin(50°)-sin(70°) = sin²1°+sin²2°+sin²3°+.+sin²89 sin^2 10°+ sin^2 50°+ sin10°sin50°计算 , 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° 计算：sin²1°+sin²2°+sin²3°...+sin²45°+sin²46°...+sin²89° 计算：sin²1°+sin²2°+sin²3°+...+sin²87°+sin²88°+sin²89° sin²1°+sin²2°+sin²3°+……+sin²87°+sin²88°+sin²89°= sin²1°+sin²2°+sin²3°+...+sin²88°+sin²89°+sin²90°=等于多少? 化简sin^(a-30°)+sin^(a+30°)-sin^a化简sin^2(a-30°)+sin^2(a+30°)-sin^2a sin(10°)+sin(20°)cos(50°)求值 尽快 我今天将就要!化简（计算）1、Sin²10°+Sin²20°+Sin²30°+Sin²40°+Sin²50°+Sin²60°+Sin²70°+Sin²80°+Sin²90°2、√（Sin44°-Cos44°)²3、√ 1-2Sim50°Cos50°4、tan41°*tan42°* 1-2sin 22.5° 1/2-sin^215° sin²1°+sin²2°+sin²3°……sin²89°=? sin²1°+sin²2°+sin²3°……sin²89°= sin²1°+sin²2°+.+sin²89°+sin²90°=? sin²1°+sin²2°+sin²3°…+sin²89°的值是多少