I'm feeling 22

Geometry Level 3

Which is closest to cos ⁡ ( 22 ) \cos(22) ? (The argument is in radians.)

1 1/2 -1/2 0 -1

Jake Lai by Jake Lai , 21, Singapore

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1 solution

Sabhrant Sachan
Jul 11, 2016

22 ≈ 7 π = 21.991 ⟹ cos ⁡ 7 π = − 1 22 \approx 7\pi = 21.991 \implies \cos{7\pi}=-1

3 Helpful 0 Interesting 0 Brilliant 0 Confused

One might justify the solution by noting the continuity of cos ⁡ \cos .

Jake Lai - 4 years, 11 months ago

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