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Some Applications Of Trigonometry

Question

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Write the value of sin² 69° + sin² 21°.

Solution

sin² 69° + sin² 21° = sin² (90 - 21°) + sin² 21°
= cos² 21° +sin² 21° = 1. 1

Some More Questions From Some Applications of Trigonometry Chapter

Choose the correct option and justify your choice:
sin 2A = 2 sin A is true when A =
(A) 0° (B) 30° (C) 45° (D) 60°

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