共50条信息
\(4\sin {{15}^{\circ }}\sin {{105}^{\circ }}=\)
已知\(\tan (π-\)\(α\)\()= \dfrac{3}{4}\),\(α\)\(∈\left(\begin{matrix} \dfrac{π}{2},π\end{matrix}\right)\),则\(\cos \)\(α\)\(=\)
\(\sin {{10}^{\circ }}\cos {{70}^{\circ }}-\cos {{10}^{\circ }}\cos {{20}^{\circ }}=(\begin{matrix} {} & {} \\\end{matrix})\)
若\(\cos (\dfrac{\pi }{4}-\alpha )=\dfrac{3}{5}\),则\(\sin 2\alpha =\) .
已知\(\tan \left(π-α\right)= \dfrac{3}{4},α∈( \dfrac{π}{2},π) \),则\(\cos α=(\) \()\)
(本小题满分10分)设圆满足:
(Ⅰ)截y轴所得弦长为2;
(Ⅱ)被x轴分成两段圆弧,其弧长的比为3∶1.
在满足条件(Ⅰ)、(Ⅱ)的所有圆中,求圆心到直线l:x-2y=0的距离最小的圆的方程.
进入组卷