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| Question | Answer |
| 1 + tan^2 x = | sec^2 x |
| sin^2 x = | 1 - cos^2 x |
| 1 + cot^2 x = | csc^2 x |
| sin2x = | 2sinxcosx |
| cos2x = | cos^2 x - sin^2 x 2cos^2 x - 1 1 - 2sin^2 x |
| tan2x = | 2tanx / (1-tan^2 x) |
| sin^2 x = (Half-angle) | (1-cos2x)/2 |
| cos^2 x = (Half-angle) | (1 + cos2x) / 2 |
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