i need help understanding and answering these questions plz show work

Questions 25) and 26) Find dy/dt. 25) y = (1 + sin 7t)'4 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 26) y = cos Mt +12) A) sin(i4t +12) B) sin[;] 4t+12 1 2 sin 4t+12 D sin '4t+12 2i4t+12 ) )I4t+12 ) C)