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Agenda

Agenda. Proving by Counter Example. Trigonometric Identities 3/22. A counter example is an example that proves something does NOT work. Counter Example . Trigonometric Identities 3/22. Prove that sin x cos x = tan x is not an identity by producting a counter example.

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Agenda

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  1. Agenda • Proving by Counter Example

  2. Trigonometric Identities 3/22 A counter example is an example that proves something does NOT work • Counter Example

  3. Trigonometric Identities 3/22 Prove that sin xcosx = tan x is not an identity by producting a counter example • Counter Example

  4. Trigonometric Identities 3/22 Prove that sin xcosx = tan x is not an identity by producting a counter example let x = 45o sin 45ocos 45o = 0.5 tan 45o = 1 • Counter Example

  5. Trigonometric Identities 3/22 Prove that sin xcosx = tan x is not an identity by producting a counter example let x = 45o sin 45ocos 45o = • Counter Example

  6. Trigonometric Identities 3/22 Prove that sin xcosx = tan x is not an identity by producting a counter example let x = 45o sin 45ocos 45o = 0.5 • Counter Example

  7. Trigonometric Identities 3/22 Prove that sin xcosx = tan x is not an identity by producting a counter example let x = 45o sin 45ocos 45o = 0.5 tan 45o = • Counter Example

  8. Trigonometric Identities 3/22 Prove that sin xcosx = tan x is not an identity by producting a counter example let x = 45o sin 45ocos 45o = 0.5 tan 45o = 1 • Counter Example

  9. Trigonometric Identities 3/22 Prove that sin xcosx = tan x is not an identity by producting a counter example let x = 45o sin 45ocos 45o = 0.5 tan 45o = 1 0.5 =/= 1 Not an identity • Counter Example

  10. Classwork • Continue on your classwork page • Complete # 18-23 on page 427 • You have 15 minutes to finish

  11. Trigonometric Identities 3/22 Use the appropriate trigonometric identity to find the value you are asked for. Example: • Determining an exact value

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