Askor claimed: I thought trigonometric substitution only operate if there is available a sq. root for instance ##sqrt x^two + 2 ##. No. Trig substitution is helpful For those who have the sum or big difference of squared conditions - they don't need to be inside of a sq. root. https://gabletoppak.com/how-i-integrated-branding-and-design-with-an-indian-paper-bottle-manufacturer/