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Marriage adjustment

score

Level of low high very high

Education

Middle school 25 5 10

High school 50 30 40

College 120 60 60

Can we conclude from the above, the higher the level of education, the greater is the degree of adjustment in marriage?

x^3-4xy^2-3x^2+12xy-12y^2+8x+2y+4=0

Q2 If a = 5i - 2j and b = -2i + 2j, find unit vectors of vectors a, b and a - b.

Q3 If u = 3i + 2j and v = -5i + 4j,

(a) Express i and j in terms of u and v.

(b) Suppose i + 8j = au + bv, find the values of a and b

Q4If a = 3i - 2j and b = 2i - 3j, find

^

(i) │a│; (ii) b ; (iii) │b - a│; (iv) │a - b│.

So in solution

2nd line (x^2/((x^2-1) (x^2+1)))dx

3rd line ((1/2)÷(x^2-1)+(1/2)÷(x^2+1))dx

I didnot understand The 3rd line please explain and what is the formula?