(PUC-RS) Para que a reta que passa por A(m
- 1, 2) e B(3, 2m) forme, com o eixo das abscissas, no sentido positivo, um ângulo de 45°, m deve ser igual a

A. -2.
B. -1/2
C. 1.
D. 1/2
E. 2.
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