Trigonometry Flashcards
1
Q
sin^2(x) + cos^2(x) = ?
A
1
2
Q
tan^2(x) + 1 = ?
A
sec^2(x)
3
Q
cot^2(x) + 1 = ?
A
cosec^2(x)
4
Q
sec^2(x) - 1 = ?
A
tan^2(x)
5
Q
cosec^2(x) - 1 = ?
A
cot^2(x)
6
Q
What is the cos rule to find an unknown side?
A
c^2 = a^2 + b^2 - 2abcosC
7
Q
What is the cos rule to find an unknown angle?
A
a^2 + b^2 - c^2
cosC = ———————–
2ab
8
Q
What is the area of a triangle using trigonometry?
A
A = 1/2absinC
