已知cos(π/6+θ)=根号3/3,求cos(5π/6-θ)的值
已知cos(π/6+θ)=根号3/3,求cos(5π/6-θ)的值
已知cos(π/6-α)=根号3/3,求cos(5π/6+α)的值
已知cos(π/6+a)=根号3/3求cos(5π/6-a)的值
已知cos(π/6-a)=根号3/3,求cos(5π/6+a)-cos²(π/3+a)
已知cos(π/6-a)=(根号3)/2,求cos(5π/6+a)-sin平方(a-π/6)的值
已知cos(x-π/6)=-根号三分之三 则cos(x)+cos(x-π/3)的值是
已知cos(π/6+a)=根号3/3,求cos(7π/6+a)的值
已知根号3sin-sin(π/2-2θ)/cos(π+θ)*cosθ=1,θ属于(0,π),求θ的值
已知cos(π/6-α)=根号3/3,求cos(5π/6+α)-sin²(-α+7π/6)的值.求详解,
已知cos(π/6—x)=根号3/3,求cos(5/6π+x)—sin平方的(x+π/6)的值
已知cos(π/6-a)=根号3/3,求cos(5π/6+a)-sin²(a-π/6)的值.
已知cos(π/6-a)=根号3/3,求cos(5π/6+a)-sin²(a-π/6)的值.