Askor claimed: I thought trigonometric substitution only get the job done if there is obtainable a sq. root including ##sqrt x^two + two ##. No. Trig substitution is helpful When you've got the sum or variation of squared conditions - they need not be inside of a square root. Customization: https://gabletoppak.com/what-makes-gabletop-pak-cartons-a-better-choice-than-plastic-bottles/