6 concepts
The Law of Sines
The law of sines can be used to find unknown angles and sides in any triangle.
The Law of Cosines
The law of cosines can be used to solve for angles and sides of a triangle in cases where other laws do not apply.
Pythagorean Identities
The Pythagorean identities are useful in simplifying expressions with trigonometric functions.
Angle Addition and Subtraction Formulae
Trigonometric expressions can be simplified using special angles and a set of formulae for adding and subtracting angles.
Double and Half Angle Formulae
Trigonometric expressions can be simplified by applying the double- and half-angle formulae.
Trigonometric Symmetry Identities
The trigonometric symmetry identities are based on principles of even and odd functions that can be observed in their graphs.