The two crossword solutions for the term 'math course, briefly' are TRIG and Calc. TRIG is short for trigonometry, which is a branch of mathematics that studies relationships between angles and sides of triangles. Calc is short for calculus, which is a branch of mathematics that deals with derivatives, integrals, and limits. Both trigonometry and calculus are important courses in mathematics and are often required for college-level math courses.