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IGCSE Extended Mathematics Formulas
nth term with one difference:
a = first number of the sequence
d = first difference
nth term with two differences:
C = second difference
Sum of arithmetic sequences:

Simple Interest: P or p = price
n = number of years
i or…

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Frequency Density = Frequency Class width
Mean of a table = (mid-point of class frequency) / total frequency

Gradient of a graph =

Midpoint of a line =

Geometry and Trigonometry
Interior Angle

Exterior Angle

Pythagoras Theorem


Sin Rule

Cosine Rule

Scale Factors


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