Askor reported: I thought trigonometric substitution only perform if there is out there a sq. root like ##sqrt x^2 + 2 ##. No. Trig substitution is helpful For those who have the sum or variance of squared conditions - they needn't be within a sq. root. In conclusion, the gable https://gabletoppak.com/choosing-between-gable-top-packaging-and-plastic-bottles-for-your-beverage-business/