$\int 5 x \sec ^{2} x d x=?$

$5[x \tan x+\ln |\sin x|]+c$

$5\left[x \sec ^{2} x+\ln |\sin x|\right]+c$

$5[x \tan x+\ln |\sec x|]+c$

$5[x \tan x-\ln |\sec x|]+c$