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Some Applications Of Trigonometry

Question

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Evaluate:
sin 25° - cos 65°

Solution

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

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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