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Trigonometry

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Solve lengths of a right triangle
a^2 + b^2 = c^2
Solve angles of a right triangle
angle1 + angle2 + angle3 = 180
Degrees to radians
f(x) = x * PI/180
Radians to degrees
f(x) = x * 180/PI
csc x =
1/sin x
sec x =
1/cos x
cot x =
1/tan x
Unit Circle Theorem
cos^2 x + sin^2 x = 1
(to minutes/seconds) 60.50
60 30'
(to minutes/seconds) 60.500245
60 30' .882"
(to degrees) 60 30'
60.50
Arc Length Formula
S = r * PI
Arcsin identities
sin(sin^-1(x)) = x, sin^-1(sin(x)) = x
Arccos identities
cos(cos^-1(x)) = x, cos^-1(cos(x)) = x
Arctan identities
tan(tan^-1(x)) = x, cos^-1(cos(x)) = x
sind(x) for 30, 45, 60
1/2, sqrt(2)/2, sqrt(3)/2
cosd(x) for 30, 45, 60
sqrt(3)/2, sqrt(2)/2, 1/2
Area of a Sector
1/2 PI Angle
Trig Function Graphs
http://www.themathpage.com/atrig/graphs-trig.htm