Askor said: I assumed trigonometric substitution only function if there is on the market a square root such as ##sqrt x^two + two ##. No. Trig substitution is useful Should you have the sum or distinction of squared terms - they needn't be inside of a square root. Gabletop Pak https://gabletoppak.com/elevate-your-brand-with-gable-top-paks-white-label-water-packaging/