Only if you ask precal questions.
Simple answer: Calculus involves derivation and integration, precal doesn't. Pre calculus gives you some of the algebraic, geometric and trigonometric understanding that is required to comprehend the concepts in calculus. Without the knowledge from precal, calculus would not be easily understood, as it is taught in schools today.
Using the Circle Unit which is a chart used in precal and calc classes, you can see that angle 150 in radians is 5pi/6. Using this, the cot value is -Root3.
if you're an architect, or for later math (a lot in precal.. etc). also u need it for SAT stuff like that. not just academics tho. general knowledge about angles is good for everyday life like when you're putting stuff away, etc.
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