a skateboarder is practing at the city park. he is skating up and down the steepest straight line ramp. if the hightest point on
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Let 
be the statement that
Check to see that holds for 
:
Now suppose that
is true, and use that assumption to show that 
must also be true. When 
, you have
and so is also true, thus proving the statement is true for all 
.
Check to see that
Now suppose that
and so