Pre-Calculus - Using the sum formula for cosine to evaluate an angle cos(75)

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Mathematics
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11th Grade - University
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Hard
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3 questions
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1.
OPEN ENDED QUESTION
3 mins • 1 pt
Explain the formula for the cosine of the sum of two angles.
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2.
OPEN ENDED QUESTION
3 mins • 1 pt
What are the exact values of cosine for 30 degrees and 45 degrees?
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3.
OPEN ENDED QUESTION
3 mins • 1 pt
How do you combine the results of cosine and sine to find the cosine of 75 degrees?
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