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OpenStudy (ksaimouli):
determine the exact value? sec(-5pie/4)
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OpenStudy (ksaimouli):
\[\sec(-5\Pi/4)\]
OpenStudy (jamesj):
sec(x) = 1/cos(x) and cos(pi+x) = -cos(x) Hence cos(5pi/4) = -cos(pi/4) = -1/sqrt(2) and sec(5pi/4) = -sqrt(2)
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