1.

If $cos^{2}\theta - sin^{2}\theta$ = $\frac{1}{3}$, where $0 \leq \theta \leq\frac{\pi}{2}$, then the value of $cos^{4}\theta - sin^{4}\theta$ is1). $\frac{1}{3}$2). $\frac{2}{3}$3). $\frac{1}{9}$4). $\frac{2}{9}$

Answer» OPTION 1 is the CORRECT answer as PER the answer KEY


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