| Reciprocal Identities | ||
| sin x = | _1_ csc x | |
| csc x = | _1_ sin x | |
| sec x = | _1_ cos x | |
| cos x = | _1_ sec x | |
| tan x = | _1_ cot x | |
| cot x = | _1_ tan x | |
| Tangent and Cotangent Identities | ||
| tan x = | sin x cos x | |
| cot x = | cos x sin x | |
| Negative Angle Identities | ||
| sin (-x) = | -sin x | |
| csc (-x) = | -csc x | |
| sec (-x) = | sec x | |
| cos (-x) = | cos x | |
| tan (-x) = | -tan x | |
| cot (-x) = | -cot x | |