Arc Cosine (acos) Calculator

Arc Cosine (acos) Calculator

Calculated acos() of the number

acos() function

Arc Cosine (acos) is the inverse function of Cosine (cos), which means that a==cos(acos(a)) for every value of a that is within acos()'s range.

This is an online free acos calculator. You can calculate value of acos() trignometric function easily using this tool.

Important Abbreviations to remember

  • SOH: Opposite / Hypotenuse (Sine)
  • CAH: Adjacent / Hypotenuse (Cosine)
  • TOA: Opposite / Adjacent (Tangent)

Understanding the Main Trigonometric Functions

In mathematics, the trigonometric functions (also called circular functions, angle functions or goniometric functions) are functions of an angle. They relate the angles of a triangle to the lengths of its sides. Degrees and Radians are units of measuring these angles. Degrees originated as an unit to measure how far constellations moved in a day (1 degree ~ 1 day of movement). Degrees measure angles by how far we tilted our heads(Observer's view point). Radians measure angles by distance traveled(Movers's view point).

Other related Trigonometry pages