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OpenStudy (anonymous):
Simplify the following expressions. a) cos(180º+x) + cos(180º-x) b)cos(7π/126º)cos(36º/5)+sin(7π/126º)sin(36º/5)
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OpenStudy (amistre64):
cos(180+x) = -(cos(x)) cos(180-x) = -(cos(x)) I would take a gander and say that (a): -2cos(x). but you should double check that. If I have learned anything in life, it is that I cannot be trusted :)
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