Question

Tolong cara utk membuktikan hasil di atas. Makasih :)

Answer 1

A sin x + b cos x = k . cos (x - α)
y = sin x +  cos x 
a = 1, b = 1
k = √(a²+b²) = √2

tan α = b/a
tan α= 1/1 =  1 = tan 45°
α = 45

sin A + cos A = √2 cos ( x -45 °)