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Simplify for 2pts. cos1º + cos2º +cos178º + cos179º

Simplify for 2pts. cos1º + cos2º +cos178º + cos179º
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Simplify for 2pts. cos1º + cos2º +cos178º + cos179º

User Chandraprakash
by
8.4k points

1 Answer

3 votes
Hello,


cos\ (a)+cos\ (b)=2*cos\ ( (a+b)/(2) )*cos\ ( (a-b)/(2) )

cos(1)+cos(179)+cos(2)+cos(178)=2 cos(90)*cos(89)+2 cos(90)*cos(88)
=2(cos(89)+cos(88))=4(cos(88.5)*cos(0.5))
User Matt Allwood
by
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