共50条信息
已知\(\cos \left( \left. x- \dfrac{π}{4} \right. \right)= \dfrac{ \sqrt{2}}{10}\),\(x∈\left( \left. \dfrac{π}{2}, \dfrac{3π}{4} \right. \right)\).
\((1)\)求\(\sin x\)的值;
\((2)\)求\(\sin \left( \left. 2x+ \dfrac{π}{3} \right. \right)\)的值.
进入组卷