List of identities
Given two functions f and g, we say f = g if f(x) = g(x) for all every x in the domain of both f and g.
Sine, Cosecant, Tangent, and Cotangent are all odd functions, so f(-x) = -f(x). The other two trigonometric functions cos and secant are even, so f(-x) = f(x)
Return to Topics Page