1
Q
Reciprocal ID for sin x
A
1 / csc x
2
Q
Reciprocal ID for cos x
A
1/ sec x
3
Q
Reciprocal ID for tan x
A
1 / cot x
4
Q
Reciprocal ID for csc x
A
1 / sin x
5
Q
Reciprocal ID for sec x
A
1 / cos x
6
Q
Reciprocal ID for cot x
A
1 / tan x
7
Q
Pythagorean Identity involving
sin x and cos x
A
cos^2 (x) + sin^2 (x) = 1
8
Q
Pythagorean Identity involving
tan x and sec x
A
1 + tan^2 (x) = sec^2 (x)
9
Q
Pythagorean Identity involving
csc x and cot x
A
1 + cot^2 (x) = csc^2 (x)
10
Q
sin ( -x )
A
- sin x
11
Q
csc ( -x)
A
- csc x
12
Q
cos ( -x)
A
cos x
13
Q
sec ( -x )
A
sec x
14
Q
tan ( -x)
A
- tan x
15
Q
cot ( -x)
A
- cot x
16
Q
sin (90 - x)
A
cos x
17
Q
cos (90 - x)
A
sin x
18
Q
tan (90 - x)
A
cot x
19
Q
cot (90 - x)
A
tan x
20
Q
complementary
A
when the sum of two angles equals 90 degrees. x and (90 - x) are complementary
21
Q
complementary functions
A
sine compl. to cosine
secant compl. to cosecant
tangent compl. to cotangent
Precalculus
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