Askor mentioned: I assumed trigonometric substitution only function if there is on the market a square root for example ##sqrt x^two + 2 ##. No. Trig substitution is helpful When you've got the sum or distinction of squared phrases - they needn't be inside a square root. The lifetime of https://gabletoppak.com/what-makes-gabletop-pak-cartons-a-better-choice-than-plastic-bottles/