without usig technology determine is cos135 degres= sin225 degrees
In terms of acute angles and by the CAST rule
cos 135 = -cos45
sin 225 = -sin 45
and since I know that sin45 = cos56
cos135° = sin225°
cos 135 = -cos45
sin 225 = -sin 45
and since I know that sin45 = cos56
cos135° = sin225°