Question: cos 45 is equal to?
Answer: The value of cos function when angle of right triangle equals to 45∘ is called cosine of angle 45 degrees. It is expressed as cos(45∘) ⁡ in mathematics as per sexagesimal system. The value of cos of angle 45 degrees in fraction is 1√2 exactly. It is an irrational number and equal to 0.7071067812…