Two Waves Travel Simultaneously Through the Same Medium

Multiple Choice

Two waves travel simultaneously through the same medium. The first wave is described by y₁(x,t) = Acos(kx-ωt) and the second wave by y₂(x,t) = B sin(kx-ωt) . If the resulting superposition can be written as y(x,t) = C cos(kx-ωt + π/5) , what is the value of A/B?

A) sin(π/5)
B) cos(π/5)
C) cot(π/5)
D) sec(π/5)
E) tan(π/5)