Pythagorean Trig Identities

Three trig identities, that re really one trig identity, that can be useful in simplifying trig expressions

Using the Pythagorean Trig Identities to simplify and/or prove trigonometric expressions

Creating the Pythagorean Trig Identities that can be used to manipulate trig expressions

Complex Numbers & Trig

Using complex numbers to prove trig identities and to solve trig equations

Manipulating trigonometric expressions using the trig identities