Askor stated: I thought trigonometric substitution only function if there is obtainable a sq. root like ##sqrt x^2 + two ##. No. Trig substitution is useful if you have the sum or difference of squared terms - they needn't be inside of a sq. root. A carton is often defined https://gabletoppak.com/how-gable-top-pak-can-enhance-your-brand-and-customer-experience/