Mathematics - Lecture 23 "Basic identities, sum and difference identities, double measure identities" presents the following content: Identities involving circular functions; establishing other identities; sum, difference and cofunction identities; double measure identities. | Basic Identities, Sum and Difference Identities, Double Measure Identities Institute of Mathematics, University of the Philippines Lecture 23 (IMath, UP) Identities Lec. 23 1 / 28 1 Identities Involving Circular Functions 2 Establishing Other Identities 3 Sum, Difference and Cofunction Identities 4 Double Measure Identities (IMath, UP) Identities Lec. 23 2 / 28 Identities Identity: equation which is true whenever all expressions in the equation are defined (IMath, UP) Identities Lec. 23 3 / 28 Identities Identity: equation which is true whenever all expressions in the equation are defined Example: cos2 θ + sin2 θ = 1 (IMath, UP) Identities Lec. 23 3 / 28 Eight Fundamental Identities (IMath, UP) Identities Lec. 23 4 / .
