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Mathematics 93 Online
OpenStudy (anonymous):

Why does -ln (cos x) = ln (sec x)?

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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