Channel: ProfRobBob

Category: Education

Tags: profrobbobanglesdifference of anglesmathstrigonometrysumtrigtarroutangentsinecosinedifferencesum of angles

Description: I work through 3 examples finding the values of trig functions applied to angles that are either added or subtracted together after introducing the sum and difference identities for sine, cosine, and tangent. Example 1 Cosine of the Difference of two Angles 5:10 Example 2 Tangent of the Sum of Two Angles 12:42 Example 3 Tangent of an Acute Angle Between 2 Lines 18:07 Other Lessons: Analytics Trigonometry and Trig Proofs profrobbob.com/pre-calculus/analytic-trigonometry-and-trig-proofs Check out ProfRobBob.com, there you will find my lessons organized by chapters within each subject. If you'd like to make a donation to support my efforts look for the "Tip the Teacher" button on my channel's homepage YouTube.com/Profrobbob