求值 sin(-1320°)cos1110°+cos(-1020°)sin750°+cos495°

Sin(-1320度）求值 求值：sin(-1920°)=求过程 求值：1-sin平方22.5° sin(10°)+sin(20°)cos(50°)求值 求值 sin(-1320°)cos1110°+cos(-1020°)sin750°+cos495° 三角函数sinα求值. sin(-π/4)求值 求值1-sin²22.5°请问这个是怎么化简并求值的 求值:sin²1°+sin²2°+...+sin²89°+sin²90°= sin(-1200°)cos1290°+cos(-1020°）sin（-1050°)+tan855求值.. 求值:3/(sin^2 20°)-1/(cos^2 20°)+64sin^2 20° 求值[sin（α+30°）-sin（α-30°）]/cosα sin(-7π／6)求值 sin(-4分之π)求值 求值sin(-17π/3) sin 11π/4 求值 求值:sin²1°+sin²2°+.+sin²(-300°)= 直接给我答案就行 计算不太明白...求值sin(-1320°）*cos1110°+cos（-1020°）sin750°+tan（-405°）求值sin25π/6+cos25π/3+tan25π/4+sin7π/3*cos13π/6-cos5π/3