共50条信息
若角\(\alpha{∈}({-}\pi{,}{-}\dfrac{\pi}{2})\),则\(\sqrt{\dfrac{1{+}\cos\alpha}{1{-}\cos\alpha}}{-}\sqrt{\dfrac{1{-}\cos\alpha}{1{+}\cos\alpha}}{=}({ })\)
下列函数中,是周期函数且最小正周期为\(π\)的是( )
已知双曲线\(\dfrac{{{x}^{2}}}{{{a}^{2}}}-\dfrac{{{y}^{2}}}{{{b}^{2}}}=1(a > 0,b > 0)\)的两条渐近线的夹角\(θ\)满足\(\sin θ=\dfrac{4}{5}\),焦点到渐近线的距离\(d=1\),则该双曲线的焦距为 ( )
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