Express sin67° + cos75° in terms of trigonometric ratios of angles between 0° and 45°.

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asked May 7, 2017 in Mathematics by Rohit Singh (61,782 points) 35 133 357

1 Answer

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answered May 7, 2017 by sforrest072 (157,439 points) 61 410 939
selected May 7, 2017 by Rohit Singh
 
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Answer

sin 67° + cos 75°
= sin (90° - 23°) + cos (90° - 15°)
= cos 23° + sin 15°

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