共50条信息
\((1)\)已知角\(\alpha \)终边上一点\(P(m,1)\),\(\cos \alpha =-\dfrac{1}{3}\),求\(\tan \alpha \)的值;
\((2)\)求值:\(\dfrac{\tan 150{}^\circ \cos \left( -210{}^\circ \right)\sin \left( -420{}^\circ \right)}{\sin 1050{}^\circ \cos \left( -600{}^\circ \right)}\)
已知角\(\alpha \)的终边与单位圆交于点\({P}(\dfrac{4}{5},\dfrac{3}{5})\).
\(⑴\)求\(\sin \alpha \),\(\tan \alpha \)的值;
\(⑵\)求\( \dfrac{\sin \left(π+α\right)+2\sin \left( \dfrac{π}{2}-α\right)}{2\cos \left(π-α\right)} \)的值.
进入组卷