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OpenStudy (anonymous):
Why does -ln (cos x) = ln (sec x)?
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OpenStudy (anonymous):
because if you use the power log rule the -1 becomes an exponent for cosx, making it cosx^-1 which is secx
OpenStudy (anonymous):
\[-\ln(cosx)=\ln(cosx)^{-1}=\ln(secx)\]
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