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M A L7.3 Sum and Difference Identities

M A L7.3 Sum and Difference Identities. Sum and Difference formulas.

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M A L7.3 Sum and Difference Identities

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  1. M A L7.3 Sum and Difference Identities

  2. Sum and Difference formulas • If you are asked to find the EXACT VALUE of a trigonometric ratio for an angle that is NOT one of the “special angles” on your circle (ie. 0, 30, 45, 60, 90, etc.) you MUST use one of the formulas summarized on page 439-441 and on your formula sheet.

  3. Find cos 15°

  4. You have got to be familiar with radian notation. Make sure you have your unit circle with all radian angle measures written with the common denominator of 12.

  5. Find cos 75°

  6. Find cos 120°

  7. Notice the similarities and differences.

  8. Find sin 15°

  9. Find sin

  10. Find the value of sin(x-y)if x= and y=

  11. Find the value of sin(x-y)if x= and y=

  12. Find the value of cos(x-y)if x= and y=

  13. Notice on your formula sheet how the signs are shown.

  14. Notice on your formula sheet how the signs are shown.

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