Askor stated: I assumed trigonometric substitution only get the job done if there is offered a square root for instance ##sqrt x^2 + two ##. No. Trig substitution is helpful When you have the sum or change of squared phrases - they don't need to be within a square root. https://gabletoppak.com/why-gabletop-cartons-outshine-pet-bottles-for-branding-opportunities/