Cases of word usage

1) the branch of mathematics in which signs and letters are used to represent quantities, as in 2A + 3A = 5A (algebra)

2) the branch of mathematics that deals with variable quantities (calculus)

3) of mathematics (mathematical)

4) (of a person) having good basic ability in mathematics (numerate)

5) the branch of mathematics that deals with the relations between the sides and angles of triangles (trigonometry)