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Solution 4.3:4f

From Förberedande kurs i matematik 1

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Using the addition formula for cosine, we can express cos(v−3) in terms of cosv and sinv,

cosv−3=cosvcos3+sinvsin3. 

Since cosv=b and sinv=1−b2  we obtain

cosv−3=b21+1−b223. 
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