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1. Cos(3x - y)

2. x^2 + y^2

3. Sin (3x - y)

4. e^-3/pix Sin(piy)

(5x+y, 3x-y) = (2, 2x) ∈Q×Q

What is the universal set you have chosen? Justify your choice of sets in the

diagram.

A ⊆ B ⇔ A ∪ B = B.

x^4-8x^3+21x^2-20x+5=0

given that the sum of two of its roots is 4 .

2x^3-x^2-22x-24=0

if two of them are in the

ratio 4:3 .

Hence provide the nature of its roots.

roots.