Q3.74 Calculate the particular solution in the form of system: [2₁ (4)] = Vcos (3t) t) ***** x + 5 (36)] 5 cos (3) for the following

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A: r=cos4(θ/4) when Now if we do  we getr=cos4(θ/4) is become

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Q: Find the minimum of the quaratic function f(x, y) = x² + xy + 2y² -5x - 6y.

A: Given quadratic function: f(x,y)=x2+xy+2y2−5x−6yPartial derivatives:∂f∂x=2x+y−5 ; ∂f∂y=x+4y−6Solving…

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