H.S. Math Class is a term that refers to a high school math class. It typically includes three main courses: TRIG, which stands for trigonometry; Calc, which stands for calculus; and Alg, which stands for algebra. Trigonometry is a branch of mathematics that studies the relationships between angles and sides of triangles, as well as the relationships between lengths and angles of more complex shapes. Calculus is a branch of mathematics that studies the rate of change of functions and their integrals. Algebra is a branch of mathematics that studies the manipulation of symbols and the rules for manipulating those symbols.