$\sin\left(\frac{5\pi}{4}\right)$  

 $\cos\left(\frac{4\pi}{3}\right)$  

 $\cot\ \left(\frac{7\pi}{6}\right)$  

 $\cos\ \left(\frac{\pi}{2}\right)$  

 $\tan\ \left(\frac{11\pi}{6}\right)$