Question: Assuming that sin = 0.6249 and cos = 0.1102 and that both and are first-quadrant angles, evaluate each of the following.

Assuming that sin θ = 0.6249 and cos ϕ = 0.1102 and that both θ and ϕ are first-quadrant angles, evaluate each of the following.

cos (θ + ϕ)

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