共50条信息
计算\(\cos 47^{\circ}\cos 13^{\circ}-\cos 43^{\circ}\sin 167^{\circ}\)的结果等于( )
\(\sin 330^{\circ}\)的值为( )
计算\(\sin \dfrac{7\pi }{6}=(\) \()\)
\(\cos \dfrac{\pi }{12}\cos \dfrac{5\pi }{12}+{{\cos }^{2}}\dfrac{\pi }{8}-\dfrac{1}{2}=(\) \()\)
已知角\(θ \)的终边过点\(A\left(4,-3\right) \),则\(\sin \left( \dfrac{9π}{2}+θ\right)= \) .
化简\(\cos 15^{\circ}\cos 45^{\circ}-\cos 75^{\circ}\sin 45^{\circ}\)的值为
\(\sin \left(- \dfrac{31π}{6}\right) \)的值是( )
进入组卷