The document presents a set of mathematical equations involving Cartesian coordinates (x, y) and polar coordinates (r, θ). It includes formulas for converting between these coordinate systems, specifically r = √(x² + y²) and θ = tan⁻¹(y/x). Additional numerical values and symbols appear but lack context.

2. y
x
x + jy = r θ
r
=
x2
+
y2
θ = tan−1 y
x
−2 −3
2
−1 −1
2
1
2
1 3
2
2
−2
−3
2
−1
−1
2
1
2
1
3
2
2
a