Suppose that tanθ =-8 over 15 and 90 degrees < θ < 180 degrees Find the exact values of .. A) cos θ over 2 B) tan θ over 2?
回答 (1)
2016-11-19 7:42 pm
the reference triangle for Θ is { - 15 , 8 , 17 } and
cos Θ = 2 cos² (Θ / 2) - 1 & Θ / 2 ≤ 90° ; use these to answer your question
cos Θ = 2 cos² (Θ / 2) - 1 & Θ / 2 ≤ 90° ; use these to answer your question
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