indefinite-integration

Question: $\int_{{}}^{{}}{{{\tan }^{4}}x\ dx=}$

1) ${{\tan }^{3}}x-\tan x+x+c$

2) $\frac{1}{3}{{\tan }^{3}}x-\tan x+x+c$

3) $\frac{1}{3}{{\tan }^{3}}x+\tan x+x+c$

4) $\frac{1}{3}{{\tan }^{3}}x+\tan x+2x+c$

Solution:

Explanation: No Explanation

Integration by substitution

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