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[```1```](https://www.mmsrn.com/cos75-kactir-cos-75-cevabi-neye-esit-cozumu-ve-ispati-nasil-yapilir/)[```2```](https://www.bylge.com/@pow/cos-75'in-de%C4%9Feri-ka%C3%A7t%C4%B1r--ASWjf5kZUs).\n\nBu değer, toplam-fark formülleri kullanılarak bulunur [```1```](https://www.mmsrn.com/cos75-kactir-cos-75-cevabi-neye-esit-cozumu-ve-ispati-nasil-yapilir/). cos75° = cos(30° + 45°) olarak ayrılır ve aşağıdaki adımlar izlenir:\n\n1. **Toplam-fark formülü**: cos(a + b) = cos a . cos b - sin a . sin b [```1```](https://www.mmsrn.com/cos75-kactir-cos-75-cevabi-neye-esit-cozumu-ve-ispati-nasil-yapilir/)[```2```](https://www.bylge.com/@pow/cos-75'in-de%C4%9Feri-ka%C3%A7t%C4%B1r--ASWjf5kZUs).\n2. **Değerlerin yerine konulması**: cos(30° + 45°) = cos30° . cos45° - sin30° . sin45° [```1```](https://www.mmsrn.com/cos75-kactir-cos-75-cevabi-neye-esit-cozumu-ve-ispati-nasil-yapilir/)[```2```](https://www.bylge.com/@pow/cos-75'in-de%C4%9Feri-ka%C3%A7t%C4%B1r--ASWjf5kZUs).\n3. **Trigonometrik değerlerin kullanılması**: (√3/2) . 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