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Simplify for 2pts. cos1º + cos2º +cos178º + cos179º
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Simplify for 2pts. cos1º + cos2º +cos178º + cos179º
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Jun 9, 2017
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Simplify for 2pts. cos1º + cos2º +cos178º + cos179º
Mathematics
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Chandraprakash
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Hello,
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))
Matt Allwood
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Jun 15, 2017
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Matt Allwood
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