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OpenStudy (anonymous):
exact value for cos^-1(cos5pi/4)
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hartnn (hartnn):
hint : cos^-1 cos (theta) = theta
OpenStudy (anonymous):
\[\cos^-1 ( \cos \Pi + \Pi/4)\]
OpenStudy (anonymous):
\[\cos^-1 ( -\cos \Pi/4)\]
OpenStudy (anonymous):
= \[-\Pi/4 = -45\]
OpenStudy (lgbasallote):
you have to express co (5 pi/4) in reference angles before applying the rule cos^-1 (cos x) = x
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OpenStudy (anonymous):
What is the color of Napoleon's white horse?
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