Here's the question you clicked on:
angiel2
how do I solve COT pi/4 without a calculator
http://www.mathwords.com/t/trig_values_of_special_angles.htm
special angles can be memorized
you are looking for \(\frac{\cos(\frac{\pi}{4})}{\sin(\frac{\pi}{4})}\)
if you know what those values are, you win, otherwise you need to look them up