How to reset the calculator
Reset the calculator (Recommended) Press SHIFT. Press 9 (CLR). The screen should show: 1: Setup 2: Memory 3: All Press 3 (All). Press = to confirm. Press AC to exit. This restores the calculator to its factory default settings. Method 2: Check the calculation mode If the calculator still behaves strangely: Press MODE. Select 1: COMP (Computation mode). This is the normal mode for everyday calculations. Method 3: Check the angle unit If trigonometric calculations (sin, cos, tan) are incorrect: Press SHIFT → MODE (SETUP). Choose: 1: Deg (Degrees) – most common. 2: Rad (Radians) – for some higher mathematics. 3: Gra (Gradians).