A geometry problem by Miki Moningkai

Geometry Level 2

LaTeX: cos ⁡ ( 2 0 ∘ ) + c o s ( 10 0 ∘ ) + c o s ( 22 0 ∘ ) = ? \large\cos (20^\circ) \ +cos (100^\circ) \ +cos (220^\circ) =?

2 -2 -1 0

Miki Moningkai by Miki Moningkai , 25, Indonesia

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1 solution

Rishabh Singhal
Jul 11, 2014

Cos20 + cos100 + cos220 = cos100 + 2cos120.cos100= cos100 + 2 -sin30.cos100= cos100 -2sin30.cos100= cos100 -2 1/2*cos100= cos100 - cos100 =0

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