Question

sin 210 + cos 135
please answer me fast please​

Answer 1

Answer:

$- \frac{1}{2} - \frac{1}{ \sqrt{2} }$

Step-by-step explanation:

$\sin(210) + \cos(135) = \sin(180 + 30) + \cos(180 - 45) \\ = - \sin(30) +( - \cos(45) ) \\ \\ = - \frac{1}{2} - \frac{1}{ \sqrt{2} }$