Question
Classify the following functions as injection, surjection or bijection:
f : Z → Z, defined by f(x) = x2 + x
f : Z → Z, defined by f(x) = x2 + x
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$\int\frac{\sin2\text{x}}{\sqrt{\cos^4\text{x}-\sin^2\text{x}+2}}\text{ dx}$
$\int\text{e}^{\text{x}}\sec\text{x}(1+\tan\text{x})\text{dx}$