Askor stated: I assumed trigonometric substitution only get the job done if there is on the market a square root such as ##sqrt x^two + 2 ##. No. Trig substitution is useful In case you have the sum or big difference of squared terms - they need not be inside https://gabletoppak.com/kerala-high-court-says-not-to-use-plastic-bottles-at-weddings-in-state/