共50条信息
点\(P\)从\((1,0)\)出发,沿单位圆逆时针方向运动\( \dfrac{2π}{3}\)弧长到达\(Q\)点,则\(Q\)点的坐标为\((\) \()\)
已知 \(\{\)第一象限角\(\}\),\(\{\)锐角\(\}\),\(\{\)小于\(90^{\circ}\)的角\(\}\),那么、、关系是\((\) \()\)
集合\(M=\left\{\begin{matrix}x|x= \dfrac{k·180^{\circ}}{2}±45^{\circ},k∈Z \end{matrix}\right\}\),\(P=\left\{\begin{matrix}x|x= \dfrac{k·180^{\circ}}{4}±90^{\circ},k∈Z \end{matrix}\right\}\),则\(M\)、\(P\)之间的关系为\((\) \()\)
已知角\(\alpha \)的顶点在原点,始边为\(x\)轴正半轴,终边与圆心在原点的单位圆交于点\(A(m,\sqrt{3}m)\),则\(\sin 2\alpha =(\) \()\)
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