3.1

Basic Trig Identities 1: http://youtu.be/THjCOk5xHYc

Develops the Reciprocal Identities, Pythagorean Identities (including Fundamental Identity) and identities writing tangent and cotangent in terms of sine and cosine.

Basic Trig Identities 2: http://youtu.be/y-xyY-Lcvsg

Uses the Basic Identities from Basic Trig Identities 1 to simplify Trig expressions.

Basic Trig Identities 3: http://youtu.be/-QfR8QDvYKw

How to use the Pythagorean identities to rewrite Trig expressions

Basic Trig Identities 4: http://youtu.be/l9dZqrHyTX4

Uses the Basic Identities from Basic Trig Identities 1 to simplify Trig expressions.

Parts 5 & 6 cover even and odd Trig identities.  If you do not know what even and odd functions are and need help understanding that concept, including how to determine if a function is even or odd, see my videos Functions 12-15 (lower down the page) which has algebraic examples. Part 5 develops the Even and Odd Trig Identities. Part 6 shows how to determine if Trig functions are even, odd, or neither.

Basic Trig Identities 5--Even and Odd Trig Identities 1: http://youtu.be/4IawewkZY9Q

Develops the even and odd Trig identities, and then uses them to simplify Trig expressions.

Basic Trig Identities 6--Even and Odd Trig Identities 2: http://youtu.be/BXJxS3cPQWM

Shows how to determine if Trig functions are even, odd, or neither.

Basic Trig Identities 7: http://youtu.be/stoY-IgYpq8

Examples simplifying Trig expressions using these Basic Identities: Reciprocal Identities, Pythagorean Identities (including Fundamental Identity) and identities writing tangent and cotangent in terms of sine and cosine, even and odd identities

Basic Trig Identities 8: http://youtu.be/CsfHFZL345M

Examples simplifying Trig expressions using these Basic Identities: Reciprocal Identities, Pythagorean Identities (including Fundamental Identity) and identities writing tangent and cotangent in terms of sine and cosine, even and odd identities

How to Prove a Trig Equation is NOT an Identity. Examples are shown on each part below.

Part 1: http://youtu.be/_307OEVZq8w

Part 2: http://youtu.be/XvGfkQyxSgE

Part 3: http://youtu.be/I-DQUHLmmgs

EVEN AND ODD IDENTITIES

Below are videos to help you understand more about even and odd functions, if you need more help on those definitions, and how to determine if a function is even, odd or neither.

Functions 12 - Even Functions: http://youtu.be/zFnrmeM0ENo

Functions 13 - Odd Functions: http://youtu.be/iuMgiNMaUgg

Functions 14 - Even and Odd Functions (more examples): http://youtu.be/FIWQf1SKM7o

Functions 15 - Even and Odd Functions (more examples): http://youtu.be/ovNNlhq1wpA