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tan x =
sin x / cos x
cot x =
cos x / sin x
sec x =
1 / cos x
csc x =
1/ sin x
sin2 x + cos2 x =
1
sec2 x - tan2 x =
1
2((sin x)(cos x)) =
sin 2x
cos2 x - sin2 x
cos 2x
sin (-x) =
-sin x
cos (-x) =
cos x
tan (-x) =
-tan (x)
sin (A+B) =
(sin A)(cos B) + (sin B)(cos A)
sin (A-B) =
(sin A)(cos B) - (sin B)(cos A)
cos (A+B) =
(cos A)(cos B)-(sin A)(sin B)
cos (A-B) =
(cos A)(cos B) + (sin A)(sin B)
Distance between two points
Square root of (X2-X1)2+(Y2-Y1)2
Midpoint Formula
(X1 + X2 / 2, Y1+Y2 / 2)
ln (ab) =
ln (a) + ln (b)
ln (a/b)
ln (a) - ln (b)
ln (an) =
n (ln (a))
ln (1/a)
-ln (a)
lim f(x) x→a- =
L (from the left)
lim f(x) x→a+ =
L (from the right)
Definition of a limit: lim f(x) x→a = L
iff lim f(x) x→a- = L = lim f(x) x→a+