He helped me figure out how to solve a problem about a kid on a spinning Ferris wheel with a bizarre formula that required the calculation of revolutions per minute to degrees per second, and cosines.
Laurie Halse Anderson -- The Impossible Knife of Memory
He reels off ten lines of tangent, sine, and cosine functions, an intricate equation springing effortlessly from his memory, and arrives at a proof.
Ron Suskind -- A Hope in the Unseen
She smoked and talked and ate for an hour without stopping, and I scribbled in my notebook as the muddy waters of tangents and cosines began to clarify.
John Green -- Looking for Alaska
As the teacher begins to repeat the verse-Hymn 189, it so happens, from the Standard Baptist HymnalCedric wordlessly gets up and moves to the blackboard, all reflex, it seems, and begins scribbling sine and cosine, X’s and parentheses.