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Solution 4.3:3a
From Förberedande kurs i matematik 1
Revision as of 10:40, 29 September 2008 by Ian (Talk | contribs)
The angle
−v
is the reflection of the angle
v
in the
x
-axis, and under such reflection the
x
-coordinate does not change, whereas the
y
-coordinate changes sign. This means that if
sin v=a, then
sin −v=−a.
−v
=−a 
