Magyar Information Contest Journal Articles

# Problem C. 849. (March 2006)

C. 849. Evaluate cot x, given that cot x=sin x?

(5 pont)

Deadline expired on 18 April 2006.

Sorry, the solution is available only in Hungarian. Google translation

Megoldás:

cos x=sin2x,

cos2x=1-sin2x=1-cos x,

cos2x+cos x-1=0,

amiből csak a nagyobbik gyök jó. Innen , ennyi ctg x értéke is.

### Statistics:

 270 students sent a solution. 5 points: 96 students. 4 points: 97 students. 3 points: 50 students. 2 points: 11 students. 1 point: 6 students. 0 point: 6 students. Unfair, not evaluated: 4 solutions.

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