###
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

###
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

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