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5 December, 20:46

Cos 110 as a function of a positive acute angle.

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  1. 5 December, 23:33
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    - cos70°

    Step-by-step explanation:

    Using the trigonometrical identity

    cos (180 - x) ° = - cos x°, thus

    cos110° = cos (180 - 110) ° = - cos70°
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