Trigonometriska Identiteter Flashcards
1
Q
cos(s + t) = ?
A
cos s * cos t - sin s * sin t
2
Q
sin(s + t) = ?
A
sin s * cos t + cos s * sin t
3
Q
cos(s - t) = ?
A
cos s * cos t + sin s * sin t
4
Q
sin(s - t) = ?
A
sin s * cos t - cos s * sin t
5
Q
The Pythagorean identity
A
cos^2 t + sin^2 t = 1
6
Q
Cos supplementary angle identities
A
cos(pi - t) = -cos t
7
Q
Sin supplementary angle identities
A
sin(pi - t) = sin t
8
Q
tan t = ?
A
sin t / cos t
9
Q
cot t = ?
A
cos t / sin t
10
Q
sec t = ?
A
1 / cos t
11
Q
csc t = ?
A
1 / sin t
12
Q
Sine Law
A
sin A / a = sin B / b + sin C / c
13
Q
Cosine Law: a^2 = ?
A
b^2 + c^2 - 2bc * cos A
14
Q
Cosine Law: b^2 = ?
A
a^2 + c^2 - 2ac * cos B
15
Q
Cosine Law: c^2 = ?
A
a^2 + b^2 - 2ab * cos C
16
Q
tan2x = ?
A
1 + sec2x
17
Q
cos2 x = ?
A
1 + cos 2x / 2
18
Q
sin2 x = ?
A
1 - cos 2x / 2
19
Q
sin 2x = ?
A
2 sin x * cos x
20
Q
cos 2x = ?
A
2 cos2 x - 1 = 1 - 2 sin2 x
21
Q
sec2 x = ?
A
1 + tan2 x
22
Q
csc2 x = ?
A
1 + cot2 x
