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How to Clear y'[0]


Newbie.
Acidently input
DSolve[{y''[t] == y[t], y[0] = 1}, y, t]

and end up setting y[0] to 1, instead of

DSolve[{y''[t] == y[t], y[0] == 1}, y, t]

However

Clear[ y , y[0] , "y*" ]

fails to Clear y[0] (not a symbol or a string) and I need to exit the 
program and start again.



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