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Trig Identities
| Question | Answer |
|---|---|
| sin^2(x)+cos^2(x) | =1 |
| 1+tan^2(x) | =sec^2(x) |
| 1+cot^2(x) | =csc^2(x) |
| sin(x) | =1/csc(x) |
| cos(x) | =1/sec(x) |
| tan(x) | =1/cot(x) |
| csc(x) | =1/sin(x) |
| sec(x) | =1/cos(x) |
| cot(x) | =1/tan(x) |
| tan(x) | =sin(x)/cos(x) |
| cot(x) | =cos(x)/sin(x) |
| sin(-x) | -sin(x) (odd) |
| cos(-x) | cos(x) (even) |
| tan(-x) | -tan(x) |
| sin(a+/-b) | =sin(a)cos(b)+/-cos(a)sin(b) |
| cos(a+/-b) | =cos(a)cos(b)∓sin(a)sin(b) |
| sin(2x) | =2sin(x)cos(x) |
| cos(2x) | cos^2(x)-sin^2(x) |
Created by:
user-1882782
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