How do physicists use trigonometry?

Answer 1

Physicists use trigonometry whenever two or more vectors (fields, forces, momentums, etc...) interact with one another. Trigonometry is especially useful in modeling waves an, which transfer energy in a manner consistant with trigonometric functions. The same is true with oscillatory motion (like a spring bouncing up and down) and electrical current, which often varies in its strength like a spring bouncing (this is AC current).