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OpenStudy (anonymous):
cos (-x)= -cos(x) true or false?
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OpenStudy (fwizbang):
cos(0) =1, so, since 0 = -0 , this can't be true. It's false.
myininaya (myininaya):
cos(-x)=cos(x) because cosine is an even function sin(-x)=-sin(x) because sine is an odd function
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