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27 reviewsProduct Details The FX991W Scientific calculator is both solar powered and battery powered. It can deal with complex numbers and backtrack step by step through calculations after they're performed. You can even edit an expression and recalculate. The expression and its result can be displayed at the same time. Matrix/Vector calculation Statistical calculations with STAT-Data Editor Solve calculations Equation calculations Numerical differention and integration 40 Scientific constants and 40 metric conversions Two-way power Slide-on hard case
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