Question

how to find the value of cos 220 degree

Answer 1

HEY MATE HERE IS YOUR ANSWER

cos220
cos (180+30)
in third quadrant cos (a) is negative
-cos (30)

$= - \frac{ \sqrt{3} }{2}$
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Answer 2

we can find the value of cos220degree by breaking it in the form 90n+x so we can write it as 90×2+40degree so this angle lies in third quadrant where cos is-ve so the ans is -cos 40degree