Problem C. 1249. (October 2014)
C. 1249. Solve the following equation:
\(\displaystyle \sqrt{\frac{\cos {15}^\circ}2 x^2  \cos {45}^\circ x
+ \sin {15}^\circ}=3 +4\sin^2 15^\circ.\)
(5 pont)
Deadline expired on 10 November 2014.
Statistics:
142 students sent a solution.  
5 points:  81 students. 
4 points:  23 students. 
3 points:  8 students. 
2 points:  5 students. 
1 point:  8 students. 
0 point:  15 students. 
Unfair, not evaluated:  2 solutions. 
