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9 November, 09:33

If cos 60° = 1/2 and sin 60º = root 3/2 find cos 240° and sin 240".

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  1. 9 November, 12:55
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    cos 240 deg = - 1/2 and sin 240 = - root (3) / 2

    Step-by-step explanation:

    if cos 60° = 1/2 and sin 60º = root 3/2 find cos 240° and sin 240".

    we know that cos 240 = cos (60 + 180) = - cos 60 = - 1/2

    cosine is negative when the angle is in the 3rd quadrant

    sin 240 = sin (60 + 180) = - root (3) / 2

    sine is also negative in the 3rd quadrant.
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