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OpenStudy (anonymous):
Help please! Simplify the following expressions. cos(270° + x) (Hint: use the sum/difference formulae) cos(4x)cos(3x) - sin(4x)sin(3x) sinθcosθ / tanθ
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OpenStudy (jdoe0001):
http://www.regentsprep.org/Regents/math/algtrig/ATT14/formulalesson.htm <-- use the cosine sum/difference for the first two
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