Trigonometrie Flashcards
1
Q
sin2x =
A
2sinxcosx
2
Q
cos2x =
A
- 2cos^2 (x) - 1
2. 1 - 2sin^2 (x)
3
Q
sin(-x) =
A
-sinx
4
Q
cos(-x) =
A
cosx
5
Q
tg(-x) =
A
-tgx
6
Q
ctg(-x) =
A
-ctgx
7
Q
sin(a+b)
A
sin a x cos b + sin b x cos a
8
Q
sin(a-b)
A
sin a x cos b - sin b x cos a
9
Q
cos(a+b)
A
cos a x cos b - sin a x sin b
10
Q
cos(a-b)
A
cos a x cos b + sin a x sin b
11
Q
sin a + sin b
A
2 sin (a+b/2) x cos (a-b/2)
12
Q
sin a - sin b
A
2 cos (a+b/2) x sin (a-b/2)
13
Q
cos a + cos b
A
2 cos (a+b/2) x cos (a-b/2)
14
Q
cos a - cos b
A
-2 sin (a+b/2) x sin (a-b/2)
15
Q
sin a x sin b
A
cos (a-b) - cos (a+b) / 2
