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 3 If every element of R has a (multiplicative) inverse, then $R = \{0\}$ 1 Parametrized Integral problem 1 Is it legal to integrate $\frac{4 }{\sqrt{ x }}$ as $4\ln \sqrt x + C$ instead of $8\sqrt{x} + C$? Why / Why not? 1 $I = \exp(-\int\frac{\cos t }{\sin t}dt)$ Help please 0 Verify that a matrix is a solution of its own characteristic polynomial??

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 5 Primes of the form $p_1p_2\dotsm p_k+1$ [closed] 3 Help proving/verifying a proof of a theorem 1 Euler's equation 1 Definition of continuous functions 0 Definition of short exact sequence.

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 3 abstract-algebra × 2 2 calculus × 2 3 group-theory × 2 2 integration × 2 3 field-theory 1 indefinite-integrals 3 ring-theory 1 parametric 2 multivariable-calculus × 2 0 eigenvalues-eigenvectors

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