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Evaluate: Sin2 40° - Cos2 50° - Mathematics

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Question

Evaluate: sin2 40° - cos2 50°

Sum
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Solution

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

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Q 1.5
Chapter 25: Complementary Angles - Exercise 25 [Page 310]

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Selina Concise Mathematics [English] Class 9 ICSE
Chapter 25 Complementary Angles
Exercise 25 | Q 1.5 | Page 310
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