Evaluate: sin2 40° - cos2 50°

sin2 40° - cos2 50° = sin2 (90° - 50°) - cos2 50° = cos2 50° - cos2 50° = 0 Hence, sin2 40° - cos2 50° = 0.

Mathematics

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sin² 40° - cos² 50°

= sin² (90° - 50°) - cos² 50°

= cos² 50° - cos² 50°

= 0

Hence, sin² 40° - cos² 50° = 0.

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