Trigonometric functions are one of the basic concepts in mathematics.

Do you remember the formula to calculate the cosine, which is one of the trigonometric functions?

It took him time to recall the poem.

This website is the official site of the company.

He ate one apple.

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.

I feel like I remember seeing that person somewhere.