∫tan x dx
"\\int\\tan xdx=\\int\\frac{\\sin x}{\\cos x}dx\\\\\nlet\\\\\nt=\\cos x\\\\\ndt=-\\sin x dx\\\\\n\\int\\frac{\\sin x}{\\cos x}dx=\\int\\frac{-dt}{t}=- \\ln|t|+c=-\\ln|\\cos x|+c"
"\\int\\tan xdx=-\\ln|cos x|+c"
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