Trigonometric Identies Video Flashcards
1
Q
(__, sin ø)
A
(cos ø, sin ø)
2
Q
(cos ø, __)
A
(cos ø, sin ø)
3
Q
Tan ø =
A
sin ø / cos ø
4
Q
cot ø =
A
cos ø / sin ø
5
Q
sec ø =
A
1 / cos ø
6
Q
csc ø =
A
1 / sin ø
7
Q
original pythagorean trigonometric identity?
A
sin^2 ø + cos^2 ø = 1
8
Q
original pythagorean trig identity divided by cos^2 ø
A
tan^2 ø + 1 = sec^2 ø
9
Q
original pythagorean trig identity divided by sin^2 ø
A
1 + cot^2 ø = csc^2 ø
10
Q
what’s the sin angle addition identity?
A
sin(x+y) = sin x cos y + cos x sin y
11
Q
sin(x+y) =
A
sin x cos y + cos x sin y
12
Q
what’s the sin angle subtraction identity?
A
sin(x-y) = sin x cos y - cos x sin y
13
Q
sin(x - y) =
A
sin x cos y - cos x sin y
14
Q
what’s the cos angle addition identity?
A
cos( x + y) = cos x cos y - sin x sin y
15
Q
what’s the cos angle substraction identity?
A
cos(x-y) = cos x cos y + sin x sin y
