1 cosa y is equal to A cos x cos y cos xcos y cos x cos ys

1. cos(a +y) is equal to (A) cos x + cos y cos x-cos y © cos x cos y-sinx siny cosa, cos y + sin x siny None of the above f(x) 2. If /(r) = 6-18, then f (, and 4P are 6x 18, 6x 3 2x-6, 2x-18 © 2x-18, 2x-3 None of the above

Solution

1) Option C) is correct

2) Option B) is correct

f(x) = 6x - 18

f(x/3) = 6(x/3) - 18 = 2x - 18

f(x)/3 = (6x - 18)/3 = 2x - 6