Texas Instruments TITANIUM TI-89 User Manual page 778

3. Enter vectors describing the initial path of
the boat, water current, and resultant path
of the boat.
Store these vectors as
value for the unknown speed of the
a
current. Use the value
the boat.
Enter:
!
[20,80 ¡ ] i
!
[a,0 ] c
¡
!
[b,60°] r
Vectors are commonly written in either polar
or rectangular form, so it is useful to convert
polar vectors into rectangular form.
4. Define function
Enter:
Define p2r(x)=[x[1,1]*cos(x[1,2]),
x[1,1]*sin(x[1,2])]
Activities
, , and . Use the
i c r
for the speed of
b
.
p2r
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