Class Notes – Trigonometry (Year 13 Maths)

Reciprocal Trigonometric Functions $sec$ $\theta$ $=$ $\frac{1}{cos\hspace{1 mm}\theta}$ $cosec$ $\theta$ $=$ $\frac{1}{sin\hspace{1 mm}\theta}$ $cot$ $\theta$ $=$ $\frac{1}{tan\hspace{1 mm}\theta}$ Trigonometric Identities $1 + tan^2\hspace {1mm}\theta \equiv sec^2\hspace{1 mm}\theta$ $1 + cot^2\hspace {1mm}\theta \equiv cosec^2\hspace{1 mm}\theta$ Compound Angle Formulae: $sin(A+B) \equiv sinAcosB Read More …