MapleBacon MapleBacon

09-12-2017
Mathematics

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Find the exact value of the expression
cos10°cos20°-sin10°sin20°
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zizoux07p0ac3m zizoux07p0ac3m

09-12-2017

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

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