trig identities
sin^2 x =
(1-cos 2x)/2
tan ^2 x =
(1-cos2x)/(1+cos2x)
tan (s+t)
(tan s + tan t )/ (1-tan s tan t)
tan (s-t)
(tan s - tan t)/(1+ tan s tan t)
What is the inverse sine of -1?
-pi/2
What is the inverse sine of -rad3/2?
-pi/3
What is the inverse tangent of -1?
-pi/4
What is the inverse sine of -1/2?
-pi/6
sin(-x) =
-sinx
tan (-x) =
-tanx
What is the inverse cosine of 1?
0
sin^2x+cos^2x=
1
sec x=
1/cosx
csc x=
1/sinx
cot x=
1/tanx
sin 2x =
2sin x cosx
tan 2x =
2tanx/(1-tan^2 x)
What is the inverse cosine of -rad3/2?
5pi/6
What quadrants for inverse cosine?
I and II
What quadrants for inverse sine?
I and IV
cos (s-t)
cos s cos t + sin s sin t
cos (s+t)
cos s cos t - sin s sin t
sin (pi/2 - u)=
cos u
cos2x =
cos^2 x- sin^2 x; = 1-2sin^2x; = 2 cos^2 x-1
cos (-x) =
cosx
cotx=
cosx/sinx
tan (pi/2-u)
cot u
1+cot^2 x=
csc^2 x
Where is secant undefined?
multiples of pi
Where is tangent undefined?
multiples of pi/2
What is the inverse cosine of -1?
pi
What is the inverse sine of 1?
pi/2
What is the inverse tangent of 1?
pi/4
csc (pi/2 - u)
sec u
tan^2 x+1=
sec^2 x
sin (s+t)
sin s cos t + cos s sin t
sin (s-t)
sin s cos t - cos s sin t
cos (pi/2-u)=
sin u
tan x=
sinx/cosx
cot (pi/2-u)
tan u
