Askor stated: I assumed trigonometric substitution only get the job done if there is offered a square root such as ##sqrt x^two + 2 ##. No. Trig substitution is useful Should you have the sum or variation of squared terms - they needn't be inside a sq. root. Even though https://gabletoppak.com/bioplastics-greenwashing-or-genuine-solution-the-truth-behind-the-hype/