●求sin(2nπ+2π/3)*cos(nπ+4π/3)的值,n属于Z

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●求sin(2nπ+2π/3)*cos(nπ+4π/3)的值,n属于Z●求sin(2nπ+2π/3)*cos(nπ+4π/3)的值,n属于Z●求sin(2nπ+2π/3)*cos(nπ+4π/3)的值

●求sin(2nπ+2π/3)*cos(nπ+4π/3)的值,n属于Z
●求sin(2nπ+2π/3)*cos(nπ+4π/3)的值,n属于Z

●求sin(2nπ+2π/3)*cos(nπ+4π/3)的值,n属于Z
sin(2nπ+2π/3)*cos(nπ+4π/3)
=sin(2π/3))*cos(nπ+4π/3)
=sin(π/3)*cos((n+1)π+π/3)
答案为:n为奇数时为:(根号3)/4
n为偶数时为:-(根号3)/4

n为奇数时:根号3/4 n为偶数时为:-根号3/4