Trig functions and other angle bits Flashcards
1
Q
Why are small angle approximations called small angle approximations?
A
Because they only apply to small angles (in radians)
2
Q
What is the equation for arc length?
A
Length = rθ
(where θ is in radians)
3
Q
What is the equation for area of a sector?
A
Area = ½r²θ
(where r is in radians)
4
Q
What’s the trig function involving sec & tan?
A
Sec²θ ≡ 1 + tan²θ
5
Q
What’s the trig function involving cosec & cot?
A
Cosec²θ ≡ Cot²θ + 1
