cos 360+cos 234+cos 162+cos 18 = ? note-numbers are in degree.

Trigonometry angle based problem.
in Trigonometry Answers by Level 1 User (580 points)

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1 Answer

kosine(18)=0.9510565162951535

kosine(162)=-0.9510565162951535...add this much & yu get zero

kosine(360)=kosine(0)=1

kosine(234)=-0.5877852522924732

up tu yu tu add 1-0.5877...
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Sir, please solve without using calculator.
by Level 1 User (580 points)
Options are-1,-1,0,2,none of these .please reply with update answer looking at options.
by Level 1 User (580 points)

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