Askor explained: I assumed trigonometric substitution only work if there is offered a square root including ##sqrt x^2 + two ##. No. Trig substitution is useful For those who have the sum or difference of squared conditions - they don't need to be within a sq. root. When the strategy https://gabletoppak.com/best-alternatives-to-plastic-water-bottles-in-kerala-for-a-greener-future/