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Sagot :
Given: cos 170
We will express (cos 170) as a function of the reference angle.
The given angle (170) falls in the second quadrant
The reference angle for the angles in the second quadrant = 180 - θ
So,
[tex]\cos 170=\cos (180-10)=-\cos 10[/tex]So, the answer will be: -cos 10
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