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| Front-side | Reverse-side |
|---|---|
| cos (-x) and sec (-x) equal | cos and sin all others equal – trig function |
| cot = x/y | cos/sin |
| cot2 + 1 | csc2 |
| sin2 + cos2 = x | 1 |
| tan = x/y | sin/cos |
| tan2 + 1 = x | sec2 |