If $sin^{4}\theta + cos^{4}\theta$ = $2 sin^{2}\theta cos^{2}\theta$, $\theta$ is an acute angle, then the value of $tan\theta$ is

If $sin^{4}\theta + cos^{4}\theta$ = $2 sin^{2}\theta cos^{2}\theta$, $\theta$ is an acute angle, then the value of $tan\theta$ is
1). 1
2). 2
3). $\sqrt{2}$
4). 0

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