Evaluate:
$\int tan x d x$

ln | sec x | + c

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ln | cos x | + c

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ln | sin x | + c

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- ln | sin x | + c

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Solution

The correct option is A $ln | sec x | + c$
Since $\frac{d}{d x} ln | sec x | = tan x$

$\Rightarrow \int tan x d x = ln | sec x | + c$

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