Question

Simplify cos(-1/3+-1/4)

Answer 1

hello :
cos(-π/3 -π/4) = cos(- (π/3 +π/4) ) = cos (π/3 +π/4)
= cos(π/3) cos(π/4) - sin(π/3) sin(π/4)
= (1/2)(√(2)/2) - (√(3)/2)(√(2)/2)
=(√(2)-√(6)/)/4

Answer 2

cod (-0.3-0.25)=
cos (-0.55)=0.45.