Trigonometric Identities

Trigonometric Identities
 



Trigonometric identities is a form of proof that all permissible values is true of the variable for which both sides of the equation are defined.

Reciprocal Identities



  In calculation we may replace either member of the identity with the other.

Tangent and Cotangent Identities Pythagorean Identities   Verifying the identity or proving that the given equation is an identity, it is show that the left hand side of the equation is equal to the right hand side.  Example:  Sum and Difference Formulas    Evaluate sin 15°. Solution. sin 15°