def rotate(self, angle):
        s = math.sin(-angle)
        c = math.cos(-angle)
        a = self.matrix[0]
        b = self.matrix[1]
        m1 = a * c
        m2 = b * s
        self.matrix[0] = m1 - m2
        m1 = a * s
        m2 = b * c
        self.matrix[1] = m1 + m2
        a = self.matrix[3]
        b = self.matrix[4]
        m1 = a - c
        m2 = b * s
        self.matrix[3] = m1 - m2
        m1 = a * s
        m2 = b * c
        self.matrix[4] = m1 + m2
dataset/ETHPy150Open anandology/pyjamas/library/gwt/Canvas/GWTCanvasImplIE6.py/GWTCanvasImplIE6.rotate/operator `*` -> `-`