- Find the indefinite integral: ∫ ((e^x)-(e^-x))dx what do I let u equal when using substitution?

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Number Theory: Find the roots of 4x^2+6x+1 in Z11 (could you please explain step by step? THANKS!)? Find all solutions to the following system of nonlinear equations.
(x − 2)^2 + y ^2 = 20
(x + 2)^2 + y^ 2 = 20? Find a positive angle, less than 360 degrees, that is coterminal with a 1715 degree angle. Please show steps!!? Discrete Help ASAP. Please write out symbolic notation.? Problem involving math induction! 1. Prove for every integer p, p^2 + 3p + 8 is even.?