Evaluate: Sin2 40° - Cos2 50°

Evaluate: sin² 40° - cos² 50°

Sum

sin² 40° - cos² 50°
= sin²(90° - 50°) - cos² 50°
= cos²50° - cos²50°
= 0

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Chapter 21: Trigonometrical Ratios [Sine, Consine, Tangent of an Angle and their Reciprocals] - EXERCISE 21 (F) [Page 334]

Chapter 21 Trigonometrical Ratios [Sine, Consine, Tangent of an Angle and their Reciprocals]
EXERCISE 21 (F) | Q 2. (v) | Page 334