Evaluate the identity using sum and difference formula

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Mathematics
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11th Grade - University
•
Hard
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2 questions
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1.
OPEN ENDED QUESTION
3 mins • 1 pt
What is the result of cosine of π half as mentioned in the text?
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2.
OPEN ENDED QUESTION
3 mins • 1 pt
What conclusion is drawn about cosine of X at the end of the discussion?
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