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In this paper, we present two infinite classes of rotation symmetric bent functions on $\\mathbb{F}_2^{n}$ of the two forms:\n  {\\rm (i)} $f(x)=\\sum_{i=0}^{m-1}x_ix_{i+m} + \\gamma(x_0+x_m,\\cdots, x_{m-1}+x_{2m-1})$,\n  {\\rm (ii)} $f_t(x)= \\sum_{i=0}^{n-1}(x_ix_{i+t}x_{i+m} +x_{i}x_{i+t})+ \\sum_{i=0}^{m-1}x_ix_{i+m}+ \\gamma(x_0+x_m,\\cdots, x_{m-1}+x_{2m-1})$,\n  \\noindent where $n=2m$, $\\gamma(X_0,X_1,\\cdots, X_{m-1})$ is any rotation symmetric polynomial, and $m/gcd(m,t)$ is odd. 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