ddx (ln(sec(x)))=tan(x)
 
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ddx (ln(sec(x)))=tan(x)
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  • ddx (ln(sec(x)))

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    Apply the chain rule:    1sec(x) ddx (sec(x))
    =1sec(x) ddx (sec(x))

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    ddx (sec(x))=sec(x)tan(x)
    =1sec(x) sec(x)tan(x)

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    Simplify 1sec(x) sec(x)tan(x):    tan(x)
    =tan(x)

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