taiwan-gsat 2009 Q2

taiwan-gsat · Other · gsat__math Trig Graphs & Exact Values
2. Let $a = \cos(\pi^{2})$. Which of the following options is correct?
(1) $a = -1$
(2) $-1 < a \leq -\frac{1}{2}$
(3) $-\frac{1}{2} < a \leq 0$
(4) $0 < a \leq \frac{1}{2}$
(5) $\frac{1}{2} < a \leq 1$
& 2 & & 13 & 5 & & 25 & 6
2. Let $a = \cos(\pi^{2})$. Which of the following options is correct?\\
(1) $a = -1$\\
(2) $-1 < a \leq -\frac{1}{2}$\\
(3) $-\frac{1}{2} < a \leq 0$\\
(4) $0 < a \leq \frac{1}{2}$\\
(5) $\frac{1}{2} < a \leq 1$