The table below shows the multiplication formulas for direct and derivative trigonometric functions: sines (sin), cosines (cos), tangents (tg) and cotangents (ctg).
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| Action | Formula | ||
| Sine work | |||
| Product of sine and cosine | |||
| Product of cosines | |||
| Tangent product | Product of tangent and cotangent | Product of cotangents |