Askor stated: I thought trigonometric substitution only get the job done if there is offered a sq. root such as ##sqrt x^2 + two ##. No. Trig substitution is useful if you have the sum or distinction of squared terms - they needn't be within a sq. root. Even though https://gabletoppak.com/single-use-plastic-water-bottles-will-not-be-available-in-himachal-from-june-1-use-glass-bottles-and-dispensers-instead/