Trigonometry is a branch of mathematics that studies triangles and the relationships between their sides and the angles between these sides. Sinus? Cosinus? Tangent? These may be the only 3 words you remember from your trigonometry class. I remember a fourth one called SOH CAH TOA from my favorite high school math teacher. Remember:
Trigonometry is an important topic in secondary school mathematics. Without a solid foundation in the subject, one cannot excel in differential and integral calculus which are prerequisite math courses in many university programs. 
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