# Find the indefinite integral. {eq}\int {\tan x\ln \left( {\cos x} \right) \ dx} {/eq}

## Question:

Find the indefinite integral.

{eq}\int {\tan x\ln \left( {\cos x} \right) \ dx} {/eq}

## Integration using Substitution:

The process of substitution is a helpful tool in integrating functions. This process allows us to express the integrand in a much simpler terms. Also, we can apply substitution in the integrand multiple times, just remember to correspondingly change the differential variable and revert to the original variables.

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Determine the indefinite integral of the function. We first express the function in terms of sine and cosine operations. From this, we allow a...