Trig Identities
These videos are from the Trigonometry Series. You can visit the page for these videos at this link: Trigonometric Identities
Deriving the Secondary Pythagorean Trig Identities
Using the Pythagorean Trig Identity to derive the secondary Pythagorean Identities
Deriving the Double Angle Trig Identities
Using the sum identities of sine and cosine to derive the double angle identities
Deriving the Cofunction Trig Identities
Using the difference identities of sine and cosine to derive the cofunction identities
Deriving the Half-Angle Trig Identities
Using the double angle identities for cosein to derive the half-angle identities for sine and cosine
Trig Identities Exercise 1
Using the reciprocal and ratio trig identities to simplify an expression
Trig Identities Exercise 2
Using the Pythagorean Identities to simplify a trig expression