Askor said: I assumed trigonometric substitution only perform if there is accessible a sq. root for example ##sqrt x^2 + two ##. No. Trig substitution is useful When you've got the sum or difference of squared conditions - they needn't be inside of a sq. root. , or flat. Within https://gabletoppak.com/single-use-plastic-water-bottles-will-not-be-available-in-himachal-from-june-1-use-glass-bottles-and-dispensers-instead/