<span>sin A cos B=1/2[sin(A-B)+sin(A+B)]
sin(at)*cos(2at)=1/2[sin(3at)-sin(at)]</span>
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sin(at)*cos(2at)=1/2[sin(3at)-sin(at)]</span>
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The base of a rectangular fish tank measures 18 inches long by 10 inches wide. If it is filled with 1,080 cubic inches of water,
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