The calculation of arccosine is a part of trigonometry.

Trigonometric functions are one of the basic concepts in mathematics.

Let's calculate the value of the cosine, which is one of the trigonometric functions.

Part of this movie is based on actual events.

An arc of electricity passed through the air.

Inside the cinema, the arc lamp was shining brightly.

This math problem requires an understanding of functions.

He calculated the area of the triangle.

He was able to solve the complex calculation quickly.

He was calculating in his head.