Askor reported: I believed trigonometric substitution only function if there is accessible a sq. root which include ##sqrt x^two + 2 ##. No. Trig substitution is useful When you've got the sum or variance of squared phrases - they don't need to be inside a square root. Advert It's a https://gabletoppak.com/why-paper-water-bottles-are-gaining-popularity-in-kerala/