Askor stated: I assumed trigonometric substitution only operate if there is offered a sq. root like ##sqrt x^two + two ##. No. Trig substitution is helpful if you have the sum or variation of squared phrases - they don't need to be within a sq. root. Ad It really is https://gabletoppak.com/what-makes-gabletop-pak-cartons-a-better-choice-than-plastic-bottles/