共50条信息
若\(α\)是第三象限角,则\(y= \dfrac{\left| \left. \sin \dfrac{α}{2} \right. \right|}{\sin \dfrac{α}{2}}+ \dfrac{\left| \left. \cos \dfrac{α}{2} \right. \right|}{\cos \dfrac{α}{2}}\)的值为\((\) \()\)
下列各对角中,终边相同的角是 ( )
若\(\alpha \)是第一象限角,则\(\sin 2\alpha \),\(\cos \dfrac{\alpha }{2}\),\(\tan \dfrac{\alpha }{2}\)中一定为正值的有\((\) \()\)
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