ap precalc formulas

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5 Terms

1
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Polar → Rectangular

x = r cos(θ) and y = r sin(θ).

2
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Rectangular → Polar

r = x² + y² and θ = tan-1(y/x)

3
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Imaginary Numbers, Polar → Rectangular

r cos(θ)+ i r sin(θ)

4
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Average Rate of Change of a Function

(f(b) - f(a)) / (b - a)

5
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Approxamating an Unknown Radian Using the Average RoC

f(θ)~f(a) + RoC(θ - a)