What is the cosine of 30 degrees?
Use cofunction identities and trig identities to find the indicated trig functions
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Mathematics
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11th Grade - University
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Hard
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The video tutorial explains trigonometric identities, focusing on sine, cosine, and tangent. It discusses the unit circle and how angles are represented as coordinates. The instructor demonstrates solving for the cosine of 30 degrees using known values of sine and tangent, emphasizing the use of reciprocal identities and rationalizing denominators in equations.
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5 questions
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1.
OPEN ENDED QUESTION
3 mins • 1 pt
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2.
OPEN ENDED QUESTION
3 mins • 1 pt
Explain the relationship between sine, cosine, and tangent in the context of the unit circle.
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3.
OPEN ENDED QUESTION
3 mins • 1 pt
What does the Pythagorean identity state about sine and cosine?
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4.
OPEN ENDED QUESTION
3 mins • 1 pt
How can you derive the cosine of an angle using sine and tangent?
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5.
OPEN ENDED QUESTION
3 mins • 1 pt
Describe the process of rationalizing the denominator when calculating cosine.
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