Askor said: I thought trigonometric substitution only function if there is obtainable a square root including ##sqrt x^2 + 2 ##. No. Trig substitution is useful if you have the sum or distinction of squared terms - they needn't be inside of a sq. root. In contrast to the RSC, https://gabletoppak.com/elevate-your-brand-with-gable-top-paks-white-label-water-packaging/