It is permissible
to say "Amin" after the Du`a' of Qunut. When the Imam is praising Allah (Glorified be He), it is sufficient for the Ma'mum (a person being led by an Imam in Prayer) to remain silent, but there is no harm if they say: "Subhanak (Praise be to You)!" or "Subhanahu (Praise be to Him)!" Likewise, there is no harm if they raise their hands during Qunut, and while uttering the Takbir of the Funeral Prayer and Salat-ul-`Eid, (Part No. 7; Page No. 49) as there are narrations indicating this.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.