Askor claimed: I assumed trigonometric substitution only get the job done if there is on the market a sq. root which include ##sqrt x^two + 2 ##. No. Trig substitution is helpful When you have the sum or distinction of squared terms - they needn't be within a square root. https://gabletoppak.com/free-water-advertising-a-sustainable-and-emotional-path-to-powerful-brand-recognition/