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Find the exact value of the expression cos10°cos20°-sin10°sin20° Please Help

Find the exact value of the expression cos10°cos20°-sin10°sin20° Please Help
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5 votes
Find the exact value of the expression
cos10°cos20°-sin10°sin20°
Please Help

User Jeconom
by
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1 Answer

3 votes
cos10 cos20 -sin10 sin20 = cos(10+20) = cos30 = √3/2
User Janaco
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