Trig Review Flashcards
rad to degrees conversion
x°=x/180 * π
degrees to rad conversion
x rads= 180/pi * x°
(Right triangle) Sin(theta)
opp/hyp
(Right triangle) Cos(theta)
adj/hyp
(Right triangle) Tan(theta)
Opp/adj
(right triangle) Cot(theta)
adj/opp
(right triangle) sec(theta)
hyp/adj
(right triangle) csc(theta)
hyp/opp
(trig identity) sin2x + cos2x=?
1
(trig identity) 1+tan2x=?
sec2x
1+cos2x=?
csc2x
(trig identity) sin(-theta)=?
-sin(theta)
(trig identity) cos(-theta)=?
cos(theta)
(trig identity) sin(x + or - y)=?
sin(x) cos(y) + or - sin(y) cos(x)
(trig identity) cos(x + or - y)=?
cos(x) cos(y) + or - sin(x) sin(y)
(trig identity) sin 2x=?
2 sin x cos x
(trig identity) cos2x=?
(1+cos 2x)/2
(trig identity) sin2x=?
(1-cos 2x)/2
Unit circle

Sin(0)=?
0
cos(o)=?
1
Sin(π/6)=?
(sqrt 1)/2
Sin(π/4)=?
(Sqrt 2)/2
Sin(π/3)=?
(sqrt 3)/2
Sin(π/2)=?
(sqrt 4)/2
Cos(π/6)=?
(sqrt 3)/2
Cos(π/4)=?
(sqrt 2)/2
Cos(π/3)=?
1/2
Cos(π/2)=?
0