Askor stated: I thought trigonometric substitution only get the job done if there is offered a square root including ##sqrt x^two + 2 ##. No. Trig substitution is helpful When you have the sum or difference of squared conditions - they don't need to be inside a square root. Uncover https://gabletoppak.com/why-gable-top-cartons-are-making-a-splash-in-the-water-industry/