DO NOT DELETE YOUR QUESTIONS - IT IS EXTREMELY RUDE! (added by Melody)
f(March) = 12.2 cos (pi6 2) + 54.9 ( Jan = 0 feb = 1 mar = 2) = I'll let you crunch the numbers. (are you SURE it isn't pi/6 * x ??)
(make sure you use radians....not degrees)
61 degrees ?
+37146 
