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OpenStudy (anonymous):
Is 4[cos(25-155)+isin(25-155)] = [4(cos(130)-isin(130))]? I need someone to check my answer.
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OpenStudy (anonymous):
4[cos(25-155)+isin(25-155)] = 4[(cos(130)-isin(130)]?
OpenStudy (turingtest):
yes that is correct.
OpenStudy (turingtest):
do you believe me?
OpenStudy (turingtest):
http://www.wolframalpha.com/input/?i=4%5Bcos%2825-155%29%2Bisin%2825-155%29%5D
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