1.

If A = sin2 θ + cos4 θ, then for all real θ, which one of the following is correct?

A. 1 ≤ A ≤ 2
B. \(\frac{3}{4} \le A \le 1\)
C. \(\frac{{13}}{{16}} \le A \le 1\)
D. \(\frac{3}{4} \le A \le \frac{{13}}{{16}}\)
Answer» C. \(\frac{{13}}{{16}} \le A \le 1\)


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