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# Precalc test 2

### Precalc test

Arithmetic sequence for nth term formula a1 +(n-1 x d)
sum of terms in an arithmetic sequence n/2(a1+an)
nth term in a geometric sequence a1 x r^n
sum of n terms in a geometric sequence a1(1-r^n)/1-r
Sum of infinite terms a1/1-r
CramÃ©es rule for D [a1 b1] [a2 b2]
Cramers rule for Dx [c1 b1] [c2 b2]
Cramers rule for Dy [a1 c1] [a2 c2]
Dx for 3x3 matrix D1 b1 c1 D2 b2 c2 D3 b3 c3
D for 3x3 matrix A1 b1 c1 A2 b2 c2 A3 b3 c3
Dy for 3x3 matrix A1 d1 c1 A2 d2 c2 A3 d3 c3
Created by: Lyd543
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