Integrate $\tan x$ and $\sec x$ (#569)

Integrate $\tan x$ and $\sec x$ (#569)

Use ∫tan⁡x dx=ln⁡∣sec⁡x∣+C\int \tan x \, dx = \ln|\sec x| + C, ∫sec⁡x dx=ln⁡∣sec⁡x+tan⁡x∣+C\int \sec x \, dx = \ln|\sec x + \tan x| + C.