Askor said: I assumed trigonometric substitution only work if there is offered a square root for instance ##sqrt x^2 + two ##. No. Trig substitution is helpful if you have the sum or variance of squared terms - they needn't be inside of a square root. Advertisement It can be https://gabletoppak.com/quenching-thirst-building-brands-how-free-water-campaigns-on-gable-top-cartons-create-impactful-brand-awareness/