Askor stated: I assumed trigonometric substitution only perform if there is offered a square root such as ##sqrt x^two + 2 ##. No. Trig substitution is useful if you have the sum or big difference of squared phrases - they need not be within a square root. Offered in 3 https://gabletoppak.com/sustainable-liquid-soap-packaging-why-gabletop-cartons-are-the-eco-friendly-choice/