共50条信息
若\(\sin α > 0\)，且\(\tan α < 0\)，则角\(α\)的终边位于 ( )
设\(α∈\left(0, \dfrac{π}{3}\right) \)，满足\(\sqrt{3}\sin α+\cos α= \dfrac{ \sqrt{6}}{2} \)
\((1)\)求\(\cos \left(α+ \dfrac{π}{6}\right) \)的值；
\((2)\)求\(\cos \left(2α+ \dfrac{7π}{12}\right) \)的值．
已知\(\alpha \)为锐角，\(\cos \alpha =\dfrac{\sqrt{5}}{5}\)，则\(\tan \left( \alpha -\dfrac{\pi }{4} \right)=\)( )
下列命题正确的是( )
若\(\sin \alpha < 0\)且\(\tan \alpha > 0\)是，则\(\alpha \)是 \((\) \()\)
\(α\)是第二象限角，则\(\dfrac{\alpha }{{2}}\)是
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