trigonometry

Question: If $A={{\sin }^{2}}\theta +{{\cos }^{4}}\theta ,$ then for all real values of $\theta$



1) $1\le A\le 2$
2) $\frac{3}{4}\le A\le 1$
3) $\frac{13}{16}\le A\le 1$
4) $\frac{3}{4}\le A\le \frac{13}{16}$
Solution: Explanation: No Explanation
Maximum & minimum values of trigonometric functions Conditional trigonometric identities

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