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Area of a triangle
1/2absinC

Sine rule
a/sinA = b/sinB = c/sinC

Logarithms
 log_{a}1 = 0
 log_{a}a = 1
 log_{a}(1/x) = log_{a}x
 log_{a}xy = log_{a}x + log_{a}y
 log_{a}(x)^{k} = klog_{a}x
 log_{a}x = n a^{x} = n

Circle equation
(xa)^{2} + (yb)^{2} = r^{2}

Distance between two points






Differentiation
 d^{2}y/dx^{2} > 0 minimum
 d^{2}y/dx^{2} < 0 maximum
dy/dx = nx ^{n1}


Integration
 ax^{n+1}/n+1

