Trigonometry 3 Flashcards
1
Q
Trigonometric identity 1
A
cos^2 A + sin^2 A = 1 and is true for all A such that 0° < A < 90°
2
Q
Trigonometric identity 2
A
1 + tan^2 A = sec^2 A and is true for all A such that 0° < A < 90°.
3
Q
Trigonometric identity 3
A
cot^2 A + 1 = cosec^2 A and is true for
all A such that 0° < A < 90°
4
Q
Sin [A + B]
A
Sin A Cos B + Cos A Sin B
5
Q
Sin [A - B]
A
Sin A Cos B - Cos A Sin b
6
Q
Cos [A + B]
A
Cos A Cos B - Sin A Sin B
7
Q
Cos [A - B]
A
Cos A Cos B + Sin A Sin B
8
Q
Tan [A + B]
A
Tan A + Tan B / 1 - Tan A Tan B
9
Q
Tan [A - B]
A
Tan A - Tan B / 1 + Tan A Tan B
10
Q
Cot [A + B]
A
Cot A Cot B - 1 / Cot A + Cot B
11
Q
Cot [A - B]
A
Cot A Cot B +
1 / Cot A - Cot B
