If , then for all…

MATHEMATICS · Single correct · CBSE · Mathematics · Introduction to Trigonometry · Introduction to Trigonometry

Problem

If A=sin⁡2x+cos⁡4xA = \sin^2 x + \cos^4 x , then for all real xx (1) 1316≤A≤1\frac{13}{16} \le A \le 1 (2) 1≤A≤21 \le A \le 2 (3) 34≤A≤1316\frac{3}{4} \le A \le \frac{13}{16} (4) 34≤A≤1\frac{3}{4} \le A \le 1

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