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cos x bsin x Rcos(x α - University of Sheffield
www.mash.dept.shef.ac.ukKey Point acosx+bsinx canbewrittenas Rcos(x−α) where R = a2 +b2, tanα = b a Thisisaveryusefultooltohaveatone’sdisposal. Itreducesthesumoftwotrigonometric ...