trigonometry

Take a case in Trigonometry—a Complement is what remains after subtracting an angle from one right-angle.

He left school at sixteen, after having mastered geometry and trigonometry, and having learned to use logarithms.

Who by an accurate Trigonometry and furniture of Instruments, hath inriched, as well geometry, as Astronomy.

Is it a good thing to let a boy use a surveying instrument unless he first learns trigonometry?

In point of fact, let us proceed to "trace a curve," as we say in the differential and integral trigonometry.