Askor claimed: I believed trigonometric substitution only get the job done if there is obtainable a sq. root including ##sqrt x^two + two ##. No. Trig substitution is helpful if you have the sum or variation of squared terms - they need not be within a sq. root. Front Gable: https://gabletoppak.com/aseptic-tetra-pak-vs-non-aseptic-gable-top-choosing-the-right-carton-for-your-needs/