Index of /wp-content/uploads/2015/09/gif.latex_y'=0/Leftrightarrow cos2x=/frac{1}{2}/Leftrightarrow 2x=/pm_/frac{/pi }{3}+k2/
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pi_ | 2017-08-15 22:09 | - |
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pi_ | 2017-08-15 22:09 | - |