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Some Applications of Trigonometry
Question
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Evaluate:
sin 25° - cos 65°

Answer

sin 25° - cos 65°.
                     = sin (90° - 65°) - cos 65°
                     = cos 65° - cos 65° = 0.

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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°