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OpenStudy (anonymous):
find exact value of cot(-17pi/4)
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OpenStudy (raden):
cot(-17pi/4) = - cot(17pi/4) = - cot(16pi/4 + pi/4) = - cot(4pi + pi/4) = - cot(2*2pi + pi/4) = - cot(pi/4) = - 1/tan(pi/4) i sure, u have remembered the value of tan(pi/4), just plug it to there
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