E.g. by substituting ƒ(x) = sin (A+Bx), we obtain

Insertion of parentheses.
Integral expression
Interpretation of solutions

Inversion.
Involution

Irrational numbers

Known numbers

Law of exponents

Laws of signs

Like terms

Limit

Linear equation

Literal equations

Logarithm

520

Proportion

169

common

Lowest common multiple 118, 366 Proportional, directly, inversely, 169