共50条信息
在平面直角坐标系中,已知点\(P\)的坐标为\(\left( \dfrac{3}{5}\mathrm{{,}}\dfrac{4}{5} \right)\),\(Q\)是第三象限内一点,\(OQ=1\)且\(∠POQ=\dfrac{3\pi}{4}\),那么点\(Q\)的横坐标为____\(.\)
若角\(α\)的终边经过点\(P_{0}(-3,-4)\),则\(\tan α=\) \((\) \()\)
已知角\(α\)的终边与单位圆\(x^{2}+y^{2}=1\)交于\(P\left( \left. \dfrac{1}{2},y_{0} \right. \right)\),则\(\sin \left( \left. \dfrac{π}{2}+2α \right. \right)=(\) \()\)
在平面直角坐标系中,\(P\)点的坐标为\(\left( \dfrac{3}{5}, \dfrac{4}{5}\right) \),\(Q\)是第三象限内一点,\(|OQ|=\)\(1\),且\(∠\)\(POQ=\)\( \dfrac{3π}{4} \),则\(Q\)点的横坐标为\((\) \()\)
已知\(\alpha\)的终边过点\((a{,}{-}2)\),若\(\tan(\pi{+}\alpha){=}\dfrac{1}{3}\),则\(a{=}\) ______ .
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