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1.                 From English-Hindi FreeDict Dictionary ver. 1.6:
                   
   
   
                   
                     
   demonstrate /dˈɛmənstɹˌeɪt/ <VT>
   1. प्रदर्शन~करना
         "I want to demonstrate the good qualities of the new SURF EXCEL before you."
         "Thousands demontrasted in front of the Secratariate against the government's policy of liberalization."
   2. प्रमाणित करना
         "Let me demonstrate to you the truth of what she's saying."