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Trigonometric Values for Non-Special Angles: Calculators and Rounding Techniques

Explore how to calculate trigonometric values for non-special angles using a calculator. Learn to find values of sine, cosine, and tangent, rounding them to four decimal places. Ensure your calculator is set to DEG mode and follow step-by-step examples, including finding angles in various quadrants. Master techniques for converting between degrees and radians, using inverse trigonometric functions, and determining reference angles. Practice with homework problems to solidify your understanding and skills in trigonometry.

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Trigonometric Values for Non-Special Angles: Calculators and Rounding Techniques

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  1. 7.5 Values of Trig Functions

  2. Trig Values for Non-special Angles Use calculator to find value & round to 4 digits * make sure calc is in DEG mode * angle first or cos first depends on calc Ex 1) Ex 2) Calc doesn’t have cot but has tan

  3. Trig Values for Non-special Angles Ex 3) Change to decimal degrees Ex 4) No degree symbol → Radians!! Change mode on calc

  4. Finding Angles Ex 5) If 0° ≤  < 360°, find the angle  in QI such that , round to nearest tenth degree trig value angle Use inverse sin to find 

  5. Ex 6) If 0 ≤ < 360, find  to nearest tenth of a degree if cos = – 0.9641, QIII First, find the related angle 180 Change trig value to positive 15.4 QIII

  6. Ex 7) Find  in Q IV to nearest tenth degree such that cot  = – 8.028 Change to (+) for ref angle 360 7.1 QIV

  7. Homework #716 Pg. 418 1 – 35 odd

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