abdalamerx abdalamerx

24-03-2020
Mathematics

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cos 110 as a function of a positive acute angle.

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jimrgrant1 jimrgrant1

24-03-2020

Answer:

- cos70°

Step-by-step explanation:

Using the trigonometrical identity

cos(180 - x)° = - cos x°, thus

cos110° = cos(180 - 110)° = - cos70°

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