uh i did this wrong so uh just ignore what i said
Factor out cosx: cosx(sinx-2)=0
cosx=0 or sinx-2=0
cosx=0 or sinx=2
the largest value of sinx is 1, sinx will never be 2, so cosx=0, x=π/2 or 3π/2 are the two answers.
11:10am
20 minutes before 12 noon is 11:40am
30 minutes before 11:40am is 11:10am