计算:tan240°*cos240°-4sin(-210°)*cos570°
sin100°*cos240°如何化简
求下列各三角函数值(1)tan240° (2)sin 3分之16π(3)sin(-6分之35π) (4)cos (-3分
已知0°<α<β<90°且sinα,sinβ是方程X2-(根号2cos40°)X+cos240°-1/2=0的两个根,求
计算:sin²1°+sin²2°+sin²3°...+sin²45°+sin
尽快 我今天将就要!化简(计算)1、Sin²10°+Sin²20°+Sin²30°+Sin
证明sin(a+b)sin(a-b)=sin²a-sin² b,并用该式计算sin²20°
计算:sin(-1200°)·cos1230°+cos(-1020°)sin(-1050°)+tan1305°
已知sin (30°) = 0.5,sin (45°) = 0.707,sin (40°)利用线性插值计算等于多少?
计算:sin方10°+sin方20°+sin方30°+sin方40°+sin方50°+sin方60°+sin方70°+s
计算[3/(sin^2)20°-[1/(cos^2)20°]+64(sin^2)20°
计算sin²10°+sin²50°+sin10°sin50°的值详细答案
计算,tan91°tan92°……tan179°/sin²1°+sin²2°+……+sin²