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Solution 4.3:4f

From Förberedande kurs i matematik 1

Revision as of 12:00, 29 September 2008 by Ian (Talk | contribs)
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Using the addition formula for cosine, we can express cosv3  in terms of cos v and sin v,


cosv3=cosvcos3+sinvsin3 


Since cos v=b and sinv=1b2  we obtain


cosv3=b21+1b223