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Trigonometry
Trigonometry Identities Cheat Sheet
Complete trigonometry identities cheat sheet with Pythagorean, reciprocal, quotient, double angle, half angle, and sum/difference formulas. Free PDF download.
Pythagorean Identities
| Name | Formula | Notes |
|---|---|---|
| Basic | The fundamental identity | |
| Tangent Form | Divide by cos² | |
| Cotangent Form | Divide by sin² |
Reciprocal Identities
| Name | Formula | Notes |
|---|---|---|
| Cosecant | ||
| Secant | ||
| Cotangent |
Quotient Identities
| Name | Formula | Notes |
|---|---|---|
| Tangent | ||
| Cotangent |
Double Angle Formulas
| Name | Formula | Notes |
|---|---|---|
| Sine | ||
| Cosine (form 1) | ||
| Cosine (form 2) | ||
| Cosine (form 3) | ||
| Tangent |
Half Angle Formulas
| Name | Formula | Notes |
|---|---|---|
| Sine | ||
| Cosine | ||
| Tangent |
Sum & Difference Formulas
| Name | Formula | Notes |
|---|---|---|
| Sine Sum | ||
| Sine Diff | ||
| Cosine Sum | ||
| Cosine Diff | ||
| Tangent Sum |
Co-Function Identities
| Name | Formula | Notes |
|---|---|---|
| Sine-Cosine | ||
| Cosine-Sine | ||
| Tangent-Cotangent |
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