Verify: cos(180° + x) = -cos x

Need a little help with this one.
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1 Answer

me ges: draw pik

x-y axises with angel up a littel abuv x-axis

angel+180 is...extend the line intu quadrant 3 (opposit direkshun)

kosine=x komponent / long side av triangel

yu see x-part go in negativ direkshun in quadrant 3
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Verify: cos(180° + x) = -cos x.
asked Nov 30, 2011 in Trigonometry Answers by anonymous | 1.6k views
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