Section+6.1

=Section 6.1 Verifying Trigonometric Identities= I. Fundamental Identities - In mathematics, an identity is an equation that is true for all values of the variable for which the expressions in the equation are defined. - If an equation is true for only some values of the variable, it is a conditional equation.

Odd Functions --> -sinx -cscx -tanx -cotx Even --> Cox sex

- A trig. function of an angle is always equal to the cofunction of the complement of an angle.
 * Cofunction Theorem**

- Start with the more complicated side of the equation. - Combine all sums and differences of fractions (quotients) into a single fraction (quotient). - Use fundamental trigonometric identities. - Use algabraeic techniques to manipulate one side of the equation until the other side of the equation is achieved. - Sometimes it is helpful to convert all trigonometric functions into sine and consines.
 * Guidelines for Verifying Trigonometric Identities**