化简tan(π-a)sin²(a+π/2)cos(2π-a)/cos^3(-a-π)tan(a-2π)=
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化简tan(π-a)sin²(a+π/2)cos(2π-a)/cos^3(-a-π)tan(a-2π)=
化简tan(π-a)sin²(a+π/2)cos(2π-a)/cos^3(-a-π)tan(a-2π)=
化简tan(π-a)sin²(a+π/2)cos(2π-a)/cos^3(-a-π)tan(a-2π)=
分子上
tan(π-a)=tan(-a)=-tana
sin²(a+π/2)=cos²a
cos(2π-a)=cos(-a)=cosa
分母上
cos^3(-a-π)=-cos^3a
tan(a-2π)=tana
所以原式=1
tan(π-a)sin²(a+π/2)cos(2π-a)/cos^3(-a-π)tan(a-2π)=-tan(a)*cos^2a*cos(a)/-cos^3a*tan(a)=1用五点法画出函数y=sin(2x-π/3)的简图。要有(列表)表格,图像。 x分别为什么点 y对应的值为多少 谢谢