It is certainly used in calculus, just as calculus can be used in trigonometry.
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Generally pre-calculus is taken after trigonometry, unless the trigonometry course was supplemented by a pre-calculus course, in which case the next course would be calculus.
Trigonometry came first thousands of years ago. Calculus was only discovered several hundered years ago.
Trigonometry is engineering math, but If you are going to study something in physics, or science, (basically this is "applied science"), you will need lots of calculus. calculus appears a lot in "Stargate".
Calculus is made up of Trig and Algebra. Most people you ask will say that the hardest part of calculus is the algebra. The best advice I can give is to know your unit circle and Pythagoreans Theorem well.
geometry, Algebra , trigonometry calculus, physics