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le 12 : Evaluate : ſ log (tan x) dx.
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Step-by-step explanation:
∫e
log(tanx)
dx
We know,
a
log
b
c
=c
log
b
a
∫e
log(tanx)
dx=∫tan
log(e)
dx=∫tanxdx
∫tanxdx=logsecx+c
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