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Mathematics 10 Online
OpenStudy (anonymous):

Why is 2cos(pi)= -2?

OpenStudy (amistre64):

cos pi = -1

OpenStudy (anonymous):

2cos(pi) = -2 cos (pi) = -2/2 cos (pi) = -1

OpenStudy (anonymous):

Why do I get positive 1 when I put it in the calculator?

OpenStudy (amistre64):

becasue your hitting the wrong button most likely

OpenStudy (amistre64):

|dw:1335108504861:dw|

OpenStudy (amistre64):

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