CIRCULAR MEASURE
180° = radians
360° = 2 radians

Length of Arc
s = r [ in radians]
Area of Sector
A = ½r² = ½rs [q in radians]

ARITHMETIC PROGRESSION
T₁,T₂,T₃... a, a + d, a + 2d...
a = T₁ - T₂ = T₃ - T₄
T_n = a + (n-1)d
S_n = ½ n[2a + (n - 1)d]
S_n = ½ n[2a + l] (l = last term)

GEOMETRIC PROGRESSION
T₁,T₂,T₃... a, ar, ar²...
T_n = ar ^n-1


BINOMIAL THEOREM
In the expansion of (1+b)ⁿ, coefficient of T_r+1 =

In the expansion of (a+b)ⁿ, T_r+1 = a^n-rb^r

(a+b)ⁿ
In the expansion of (1+b)ⁿ, T_r+1 = b^r
(1+b)ⁿ


Amaths4
Amaths5
Amaths1
Amaths2

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