If $(a+\frac{1}{a})^{2}=3$ , then the value of $a^{18}+a^{12}+a^{6}+1$ is?

If $(a+\frac{1}{a})^{2}=3$ , then the value of $a^{18}+a^{12}+a^{6}+1$ is?
1). 3
2). 1
3). 0
4). 2

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