Question

Express sin 75 degrees + cos 65 degrees in terms of trigonometric ratios of angles between 0 degrees and 45 degrees

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Answer 1

Answer:

cos15+sin25

Step-by-step explanation:

$\sin(90 - 15) + \cos(90 - 25)$

$\sin(90 - theta) = \cos \: theta$

$cos \: 15 + sin25$

$\cos(90 - theta) = sin \: theta$

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