Cosine calculator to easily calculate the cosine function of any number. Calculate cos (x) with our trigonometric calculator. Cos calculator with degrees and radians to express the angle. We will discuss what are different ... Free math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, just like a math tutor. Cos 90 degrees To define the cosine function of an acute angle, consider a right-angled triangle provided with the angle of interest and the sides of a triangle. The three sides of the triangle are defined as follows:
