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Solution 4.3:3b
From Förberedande kurs i matematik 1
Revision as of 13:23, 9 October 2008 by Tek (Talk | contribs)
The angle −v makes the same angle with the negative x-axis as the angle v makes with the positive x-axis and this means that −v is the reflection of v in the y-axis.
Under such reflection, the angle's y-coordinate does not change (but the x-coordinate changes sign) and therefore sin(−v)=sinv=a.
−v
