"mathematical equation, formula" HD wallpaper online crop

Online crop tool usage: "mathematical equation, formula HD wallpaper" original size is 1024x768, you can online crop this wallpaper to any sizes. Drag area with blue border below to select which to crop, double click dark area to toggle "drag" and "crop" mode, use your middle mouse button to zoom in or zoom out, then click blue button to download cropped wallpaper.