A Deleting a Character or Function

Example: To  correct the expression 369       12 so it

becomes 369   12

Insert Mode:

369**12

dd

Y

Overwrite Mode:

369**12

ddd

Y

A Correcting a Calculation

Example: To correct cos(60) so it becomes sin(60)

Insert Mode:

12(cos)60)

dddY

11(sin)

Overwrite Mode:

12(cos)60)

dddd

11(sin)

E 26