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Let

f(x)=cos⁡(x)−3sin⁡(x)

Find values of R>0 and 0<α<π such that

f″(x)=Rsin⁡(x−α)

giving the value of α to 3 significant figures.


Differentiate twice to get f″(x), then put f″(x) into


Give the value of Rα to three significant figures.