HP -225 Owner's Manual page 121

Scientific calculator
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Additional Examples
Vector Calculations
The following examples use polar/rectangular coordinate conversions
to do vector operations.
Adding Two Vectors in Polar Coordinates
The sum of two vectors x;i+y;j and x,i+y,j is (x;+x)1 + (¥ +1))j.
Example: Part 1: A ship travels 150 miles on a course 60° east of
north, and then travels an additional 80 miles on a course 15° west of
north. How far is the ship from its starting point?
N
15°
} 105°
8: Additional Examples
113

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