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To compute the LS factor for the USLE model, the following equation easily works in ArcGIS. How can I perform the same in QGIS under GRASS r.mapcalc?

LSfator = Power (("flowaccNW") * resolution/22.1, 0.6) *
Power(Sin("slope_degnw") * 0.01745) / 0.09, 1.3

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