You can't get a previous answer, just a previous question (input equation). Press [2nd][ENTER] to scroll up to previous equations entered, then hit [ENTER] to evaluate it again, or edit it before evaluating it. In the future, you can put press [STO>][XT0n] at the end of your equation to save the answer to the variable X, which can then be used in other future equations. You can, in fact, use all 27 variables A-Z and theta to store temporary answers.
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