sin(6/π-a)=1/3 sina=
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sin(6/π-a)=1/3 sina=
已知sin(π+a)=1/3,则sina=
1.求证:[sin^2a+tan(a/2)tana+cos^2]*(sin^2a/2cosa)=tana [sin^2a 是sina指的平方,可能看不太清]2.已知:tan(a/2)=2,求(6sina+cosa)/(3sina-2cosa)的值3.已知:sin^2a+sin2acosa-cos2a=1,a属于(0,π/2),求sina,tana
sinA=3sin(2π/3-A) SINA=?sinA=3sin(2π/3-A) SINA=?答案是-3√3cosA
1- sin(2π/3 - a)/sina
sin(a+kπ)=2cos[a+(k+1)π].求5cosa+3sina/4sina-2cosa
sin(a+kπ)=2cos[a+(k+1)π].求5cosa+3sina/4sina-2cosa
sina+cosa/sina-cosa=3,计算1/(sin²a-sinacosa-cos²a)
sin(3π-a)=sina?三角函数诱导
已知sina=-1/3 则sin(a+x)=
f(x)=(2cos^2 a/2-sina-1)/(sin(a+π/3)sin(a-π/3)
已知tan{π/4+a}=3,求sina*sin(3π /2 +a)-sin^2a+1的值
设(sina)^2-sina-2(cosa)^2=0,求sin(a-3π/2)
sin(360度-a)=-sina为什么啊?sin(π-a)不是等于sina吗?
sina=2cosa,求(1)3sina+2cosa(2)sin²a+sina×cosa+3
证明sinA+sin(A+2π/3)+sin(A-2π/3)=0
证明sinA+sin(A+2π/3)+sin(A-2π/3)=0
sina=-8/17,a∈(3π/2,2π),求sin(π/6+a)