Trigonometry Flashcards
1
Q
Where does y=sinx cross the x-axis
A
-180, 0, 180, 360
2
Q
sec x =
A
1/ cos x
3
Q
cot x =
A
1/ tan x
4
Q
cosec x =
A
1/ sin x
5
Q
1 + tan^2 x =
A
sec ^2 x
6
Q
1 + cot ^2 x=
A
cosec 2^ x
7
Q
when pi in the interval
A
must switch to radians
8
Q
when theta is small and measured in radians, sin theta =
A
theta
9
Q
when theta is small and measured in radians, tan theta =
A
theta
10
Q
when theta is small and measured in radians, cos theta =
A
1 - (theta squared / 2)
11
Q
in radians arc length =
A
L = r theta
12
Q
in radians area of a sector =
A
0.5 r squared theta
13
Q
trig identities
sin ^2 theta =
A
1 - cos ^2 theta
14
Q
trig identities
cos ^2 theta =
A
1 - sin ^2 theta
15
Q
tan theta =
A
sin theta / cos theta
16
Q
trig identities
1 =
A
cos ^2 theta + sin ^2 theta
17
Q
when multiple angle ( e.g 3 theta)
A
change limits first
