0.3=sin

sin阿尔法+sin贝塔=?sin阿尔法+sin贝塔=?sin阿尔法+sin贝塔=?sinα+sinβ=2sin[(α+β)/2]cos[(α-β)/2]

sin^20+cos^50=sin^30sin^70=sin^20+cos^50=sin^30sin^70=sin^20+cos^50=sin^30sin^70=sin20+cos50=sin20+s

【证明】SinA+sinB=2Sin22【证明】SinA+sinB=2Sin22【证明】SinA+sinB=2Sin22应该是sinA+sinB=2sin[(A+B)/2]cos[(A-B)/2]A=

三角函数证明(sinα+sinθ)*(sinα-sinθ)=sin(α+θ)*sin(α-θ)求证(sinα+sinθ)*(sinα-sinθ)=sin(α+θ)*sin(α-θ)三角函数证明(sin

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

sin阿尔法+sin贝塔=?具体点sin阿尔法+sin贝塔=?具体点sin阿尔法+sin贝塔=?具体点sina+sinb=sin[(a+b)/2+(a-b)/2]+sin[(a+b)/2-(a-b)/

为什么sin-sin^2=1/4为什么sin-sin^2=1/4为什么sin-sin^2=1/4你用分解因式的方法很容易就能得到答案啊.sin-sin^2-1/4=-(sin-1/2)^2不用想的那么

sin(arccos(2sin(a)))=sin(arccos(2sin(a)))=sin(arccos(2sin(a)))=sin(arccos(2sin(a)))=√(1-4sin²a)

解方程|sinx|=-sinx解方程|sinx|=-sinx解方程|sinx|=-sinx|sinx|=-sinxsinx

sin(a-15)=-sin(15-a)?sin(a-15)=-sin(15-a)?sin(a-15)=-sin(15-a)?sinx是个奇函数.（画图就知道）所以有sinx=-sin-x所以sin(

为什么sin(?)=cos(?)为什么sin(?)=cos(?) 为什么sin(?)=cos(?)sin(45°)=COS(315°)=45°=315°你想说什么（sin阿尔法）＾2+（co

sin(arcsin1)=?sin(arcsin1)=?sin(arcsin1)=?arcsin1＝pi/2sin(pi/2)=11

sin(arcsin3/4)=sin(arcsin3/4)=sin(arcsin3/4)=arcsin3/4表示正弦值为3/4的锐角sin(arcsin3/4)=3/4

sinx+sin-x=sinx+sin-x=sinx+sin-x==sinx-sinx=0

sin(-π)=?sin(-π)=?sin(-π)=?-sin派

sin2@-sin@=?sin2@-sin@=?sin2@-sin@=?

sin(-1300度)=?sin(-1300度)=?sin(-1300度)=?sin(-1300)=sin(360*4-1300)=sin(140)=sin(180-140)=sin40sin(40度

sin²A=sin²A=sin²A=1-(cosA)^2若有什么不懂的欢迎来问=1/2(cos2A-1)1-（cosA）^2(1-cos(2A))/21-cos^2(A)

sin(arccos1/3)=?sin(arccos1/3)=?sin(arccos1/3)=?cos(arccos1/3)=1/3sin(arccos1/3)^2+cos(arccos1/3)^2=

sin(arccos1/4)=?sin(arccos1/4)=?sin(arccos1/4)=?令x=arccos(1/4),则x∈(0,π),且cosx=1/4.所以sinx=√[1-(cosx)^