cos 75°sin105°-sin225°sin165°化简求值

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cos 75°sin105°-sin225°sin165°化简求值

cos 75°sin105°-sin225°sin165°化简求值
cos 75°sin105°-sin225°sin165°化简求值

cos 75°sin105°-sin225°sin165°化简求值
cos75° sin105° - sin225° sin165°
= sin15° sin85° + sin45° sin15°
= sin15° (sin85° + sin45°)
= sin15° (sin85° + sin45°)
= 0.2588 × 1.7033
= 0.4408