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OpenStudy (anonymous):
Find the exact value: cot ^-1 (cot(11pi/4))
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OpenStudy (cwrw238):
cot x is the cotangent of the angle x cot^-1 x means the angle whose cotangents is x
OpenStudy (zzr0ck3r):
11pi/4 = -pi/4 and the range of cot inverse is -pi/2 to pi/2 so we have cot^-1(cot(11pi/4) = cot^-1(cot(-pi/4)) = -pi/4
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