已知sin (30°) = 0.5,sin (45°) = 0.707,sin (40°)利用线性插值计算等于多少?
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:sin²1°+sin²2°+sin²3°...+sin²45°+sin
证明sin(a+b)sin(a-b)=sin²a-sin² b,并用该式计算sin²20°
sin(sin(sin(sin(x)=cos(cos(cos(cos(x),X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
sin平方90°等于多少
sin平方60°等于多少?
已知tanα=2,计算:[sin(90°+α)-cos(180°-α)]/[sin(90°-α)-sin(180°-α)
已知sin(45°-a)=-2/3,45°<a<90°,则sina等于多少
证明sin(a+b)sin(a-b)=sin^2 a-sin^2 b, 并利用该式计算sin^2 20度=sin 80度
sin(15)×sin(30)×sin(75)等于多少
sin平方45°+tan60°×cos30°等于多少?