30 Questions
Question 1
Multiple Choice
sin x ± sin y
Question 2
Multiple Choice
sin(a−b)
Question 3
Multiple Choice
tan(a−b)
Question 4
Multiple Choice
cos a sin b
Question 5
Multiple Choice
cos(a−b)
Question 6
Multiple Choice
sin 2x
Question 7
Multiple Choice
cos(a+b)
Question 8
Multiple Choice
sin^3 x
Question 9
Multiple Choice
cos^3 x
Question 10
Multiple Choice
2 sin x cos x
Trigonometry Identities
Flashcards generated with inquiziti.com. Cut along the dashed lines. Fold in half on the solid line.
sin x ± sin y
2 sin((x±y)/2) cos((x∓y)/2)
sin(a−b)
sin a cos b − cos a sin b
tan(a−b)
(tan a − tan b)/(1 + tan a tan b)
cos a sin b
(1/2)[sin(a+b) − sin(a−b)]
cos(a−b)
cos a cos b + sin a sin b
sin 2x
2 sin x cos x
cos(a+b)
cos a cos b − sin a sin b
sin^3 x
(3 sin x − sin 3x)/4
cos^3 x
(3 cos x + cos 3x)/4
2 sin x cos x
sin 2x
sin(a+b)
sin a cos b + cos a sin b
cos^4 x
(3 + 4 cos 2x + cos 4x)/8
cos 2x
2 cos^2 x − 1
sin x cos x
(1/2) sin 2x
cos a cos b
(1/2)[cos(a+b) + cos(a−b)]
tan 2x
(2 tan x)/(1 − tan^2 x)
sin^2 x − cos^2 x
−cos 2x
cos^2 x − sin^2 x
cos 2x
tan^2 x
(1 − cos 2x)/(1 + cos 2x)
cos x − cos y
−2 sin((x+y)/2) sin((x−y)/2)
sin^2 x cos^2 x
(1/4) sin^2 2x
sin a sin b
(1/2)[cos(a−b) − cos(a+b)]
tan x ± tan y
(sin(x±y))/(cos x cos y)
cos x + cos y
2 cos((x+y)/2) cos((x−y)/2)
cos 2x
1 − 2 sin^2 x
sin a cos b
(1/2)[sin(a+b) + sin(a−b)]
tan(a+b)
(tan a + tan b)/(1 − tan a tan b)
sin^2 x
(1 − cos 2x)/2
cos^2 x
(1 + cos 2x)/2
sin^4 x
(3 − 4 cos 2x + cos 4x)/8