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OpenStudy (anonymous):
find the exact value of the given trigonometric function cos-11π/4
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OpenStudy (anonymous):
cos(-11pi/4)=cos(-11pi/4+2pi)=cos(-3pi/4)=cos(3pi/4)=-cos(pi/4)=-1/sqrt(2) \[-\frac{1}{\sqrt{2}}\]
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