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  • 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 zizoux07p0ac3m
  • 09-12-2017
cos10 cos20 -sin10 sin20 = cos(10+20) = cos30 = √3/2
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