Askor mentioned: I thought trigonometric substitution only perform if there is out there a square root for instance ##sqrt x^two + 2 ##. No. Trig substitution is helpful if you have the sum or change of squared conditions - they needn't be inside of a square root. The exponential dies https://gabletoppak.com/reducing-microplastics-why-gable-top-cartons-are-better-than-plastic-water-bottles/