Pre-Calculus 12 Notes

By: Gen L.

Lesson 2: Pythagorean Identities

The Pythagorean Identities

Verify

Verify means plug in an angle to see if it works.

Verify that using

Proving Using Identities

Prove means substituting identities until both sides are equal.

More Proofs

More Proofs, cont

Proofs, cont.

Rules of Proofs

• NEVER cross the equal sign
• Work vertically

Hints

• Change to and
• Common Denominator
• Factoring
• "Glaring Identities" (Identities 1-5)
• Complex Fractions
• Conjugates
• Aim for the denominator you want

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