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Posted by on Monday, October 24, 2011 at 10:58pm.

Find the exact values of the following.

cos 270 degrees = 90 degrees, value = 0.

Sin 180 degrees = 180-90 = 90 = 1, but its supposed to be zero, don't know how to get that:\

Confused with tan 240 degrees as well.

  • Calculus - , Monday, October 24, 2011 at 11:17pm

    for the first two, like I told you in the last post, look at the graphs

    for tan 240°
    1. where is the angle ? in III , so the answer is -
    2. how far to the x-axis? 60°

    so tan240° = -tan60° = √3/1 , (from the 30-60- 90 triangle ratio)

    always check with your calculator

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