Trig Proof 4

In this lesson, the instructor shows how to prove two trigonometric identities using fundamental and Pythagorean identities. The left-hand side of the identities are simplified first and then transformed using algebraic steps to match the right-hand side. The instructor emphasizes that there isn't just one way to prove a trigonometric identity as long as the algebraic steps and identities used are correct. Overall, this lesson shows that with a good understanding of the fundamental and Pythagorean identities, anyone can prove trigonometric identities.

Shows steps for proving (or verifying) Trigonometric Identities;

• How do you verify / prove trig identities?
• What are some fundamental trig identities that you need to know to prove trig formulas?
• What are the Pythagorean identities for trigonometry?
• How do you prove that -1/(tan(x) - sec(x)) = (1 + sin(x))/cos(x)?
• How do you prove that (1 -sin^2(x)*csc^2(x) + sin^2(x))/cos^2(x) = tan^2(x)?