Solving Trig Equations

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Solving Trig Equations

• Day Three

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Learning Goal

• I will be able to use standard algebraic
  techniques and fundamental trigonometric
  identities to solve equations.

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Solve in 0, 2p)
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Solve for 0, 360)
0 ? lt 360 so 0 2? lt 720 (multiply by
2) Let 2? r. So 0 r lt 720 Then the
equation is cos r v2/2. From twice around the
unit circle, r 45, 315, 405 675. But we
wanted ?, so divide them all by 2 (r 2?). ?
22.5, 157.5, 202.5, 337.5
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Solve in 0, 2p)
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Learning Goal

• I will be able to use standard algebraic
  techniques and fundamental trigonometric
  identities to solve equations.

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End of notes.

• Now do homework WS.