trig

639

cos(12)cos(-3) - sin(12)sin(-3)
Simplify

Guest Mar 7, 2014

+118723

Leary:
cos(12)cos(-3) - sin(12)sin(-3)
Simplify

Hi Leary,

cos(A+B) = CosAcosB - SinASinB
therefore
the answer is cos(12+-3) = cos(9)

Melody Mar 7, 2014