devcoder
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### Questions (16)

 8 How to prove $\phi(mn) > \phi(m)\phi(n)$ if $(m,n) \ne 1$ 6 What is the quadrilateral formed by the angle bisectors of a parallelogram? 2 Find an orientation preserving isometry $f (z) = \frac{az+b}{cz+d}$ such that $f (i) = 17 + 3i$ 2 Finding a hyperbolic isometry that fixes the point $x = 2$ and $x = 17$ 2 Need help with this geometry problem on proving three points are collinear

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### Tags (12)

 0 geometry × 8 0 prime-numbers × 2 0 complex-analysis × 6 0 quadrilateral 0 elementary-number-theory × 4 0 roots 0 totient-function × 3 0 solid-angle 0 transformation × 2 0 hyperbolic-geometry

### Accounts (5)

 Stack Overflow 779 rep 11224 Mathematics 251 rep 112 Database Administrators 111 rep 2 User Experience 106 rep 1 Programmers 101 rep