Askor mentioned: I assumed trigonometric substitution only get the job done if there is obtainable a sq. root like ##sqrt x^2 + 2 ##. No. Trig substitution is helpful When you have the sum or variance of squared terms - they needn't be inside a square root. The size of https://gabletoppak.com/kerala-get-ready-to-say-no-to-plastic-from-october-2/