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Question Number 58358 by Mahmoud A.R last updated on 22/Apr/19
knowingthat:cos(x)=∑∞n=1(−1)nx2n(2n)!sin(x)=∑∞n=1(−1)nx2n+1(2n+1)!profthat:cos(x+y)=cos(x)cos(y)−sin(x)sin(y)
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