integral of 1/sqrt(x^2+16)

Trig Substitution, calculus 2 tutorial, integral of 1/sqrt(x^2+16). integral of sec(x),    • integral of sec(x)   Check out my 100 integrals:    • 100 integrals (world record?)   ---------------------------------------- 🛍 Shop my math t-shirt & hoodies: amzn.to/3qBeuw6 💪 Get my math notes by becoming a patron:   / blackpenredpen   #blackpenredpen #math #calculus #apcalculus