Askor claimed: I believed trigonometric substitution only get the job done if there is out there a sq. root such as ##sqrt x^two + two ##. No. Trig substitution is useful if you have the sum or distinction of squared terms - they need not be inside a sq. root. https://gabletoppak.com/is-it-legal-to-sell-natural-mineral-water-in-gabletop-cartons-tetra-paks-and-aluminium-cans-in-india/