SOLUTION: (cos250*cos25) + (sin250*sin25) a.k.a. (the cosine of 250 degrees multiplied by the cosine of 25 degrees) plus (the sine of 250 degrees multiplied by the sine of 25 degrees)

Algebra ->  Trigonometry-basics -> SOLUTION: (cos250*cos25) + (sin250*sin25) a.k.a. (the cosine of 250 degrees multiplied by the cosine of 25 degrees) plus (the sine of 250 degrees multiplied by the sine of 25 degrees)      Log On


   

Question 41984: (cos250*cos25) + (sin250*sin25)
a.k.a. (the cosine of 250 degrees multiplied by the cosine of 25 degrees) plus (the sine of 250 degrees multiplied by the sine of 25 degrees)
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
cosAcosB + sinAsinB = cos(A-B) so that
(cos250*cos25) + (sin250*sin25) =
cos(250-25) = cos(225) = -rad(2) / 2