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Evaluate the expression under the given conditions. cos(θ − ϕ); cos(θ) = 3/5, θ in Quadrant IV, tan(ϕ) = −15, ϕ in Quadrant II?

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  • Evaluate the expression under the given conditions. cos(θ − ϕ); cos(θ) = 3/5, θ in Quadrant IV, tan(ϕ) = −15, ϕ in Quadrant II?


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