# Category Archives: C3 maths

# Little exams coming up, October 2015

We have to do our first exam, to test progress, in the week ending 16 October 2015. It’ll be a 50-minute test (not 90 minutes). Continue reading

# Why sec and cosec are called sec and cosec

Sec θ is called sec θ because geometrically, in the diagram above, it is the “secant” line (“secant”, from a Latin word meaning cut, is a line from a point cutting through a circled). Continue reading

# Algebraic fractions: adding and dividing

**Starter:** calculate some additions of ordinary numerical fractions, and then of algebraic fractions. Continue reading

# Algebraic fractions: simplifying

**Starter:**

Simplify

(√2 + 3)/(2√2 + 6)

(½√3 + 1)/(⅓√3 + ^{2}⁄_{3})

(√2 + 2)/(3√2 + 8)

Continue reading