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OpenStudy (anonymous):
cos x cos y = ½(sin(x+y)+sin(x-y)) true or false?
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OpenStudy (callisto):
false... cos x cos y = ½(cos(x+y)+cos(x-y)) While sin x cos y = ½(sin(x+y)+sin(x-y)
OpenStudy (anonymous):
thanks!(:
OpenStudy (callisto):
welcome~
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