The Toyota logo is seen on a car in a park lot in Sao Paulo, Brazil June 2, 2017. REUTERS/Paulo Whitaker TOKYO (Reuters) - Toyota Motor Corp (7203.T), Mazda Motor Corp (7261.T) and parts maker Denso Corp (6902.T) are planning to set up a joint venture to develop electric vehicles, sources familiar with matter said. Toyota, Japan’s biggest automaker, agreed to take a 5 percent stake in smaller rival Mazda in August and the two have flagged plans to jointly develop electric vehicle technologies.