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Trig – 11/7/2014

Trig – 11/7/2014. 313 HW: p382 33-42, 45, 47, 49, 51, 59, 61 Honors: 89, 91. Find the exact values of sin 2 x , cos 2 x , and tan 2 x. Today’s Lesson: Half-Angle Formulas. Trig/Pre-Calculus. Today’s Lesson: Half-Angle Formulas. You will:

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Trig – 11/7/2014

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  1. Trig – 11/7/2014 313 HW: p382 33-42, 45, 47, 49, 51, 59, 61 Honors: 89, 91 Find the exact values of sin 2x, cos 2x, and tan 2x. Today’s Lesson: Half-Angle Formulas

  2. Trig/Pre-Calculus Today’s Lesson: Half-Angle Formulas You will: • Use the Half-Angle Formulas to rewrite and evaluate trig functions.

  3. Half-Angle Formulas

  4. 105o 210o Always look at the angle on the unit circle! Find the exact value of the sin, cos, and tan of 105o. In QII, sin is positive.

  5. 105o 210o Always look at the angle on the unit circle! Find the exact value of the sin, cos, and tan of 105o. In QII, cos is negative.

  6. 105o 210o Always look at the angle on the unit circle! Find the exact value of the sin, cos, and tan of 105o.

  7. 150o 75o Find the exact value of the sin, cos, and tan of 75o. Always look at the angle on the unit circle! In QI, sin is positive.

  8. 150o 75o Find the exact value of the sin, cos, and tan of 75o. Always look at the angle on the unit circle! In QI, cos is positive.

  9. 150o 75o Find the exact value of the sin, cos, and tan of 75o. Always look at the angle on the unit circle!

  10. Find the exact values of sin2u, cos2u, and tan2u using the double-angle formula.

  11. Rewrite the expression using the power-reducing formula.

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