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OpenStudy (anonymous):
using the fact that sin47=0.7314, evaluate cos223
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OpenStudy (anonymous):
i get -0.7314 is this correct?
OpenStudy (raden):
cos(270 - x) = -sin(x) so, cos(270 - 47) = -sin47 = -0.7314, you are right !
OpenStudy (anonymous):
thank you :)
OpenStudy (raden):
welcome :)
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