JEE Math Practice Question
If $$A = {\sin ^2}x + {\cos ^4}x,$$ then for all real $$x$$:
- A.$${{13} \over {16}} \le A \le 1$$
- B.$$1 \le A \le 2$$
- C.$${3 \over 4} \le A \le {{13} \over {16}}$$
- D.$${{3} \over {4}} \le A \le 1$$
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