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Solution 4.3:4b

From Förberedande kurs i matematik 1

Revision as of 11:42, 29 September 2008 by Ian (Talk | contribs)
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If we once again use the Pythagorean identity we get


cos2v+sin2v=1sinv=1−cos2v 


Because the angle v lies between 0 and , sin v is positive (an angle in the first and second quadrants has a positive y -coordinate) and therefore


sinv=+1−cos2v=1−b2 

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