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  1. C

    Trig. half-angle formulas help?

    I'm not looking for just an "answer". I'd really like work shown so I can see what I am doing wrong. Assume that for some value of "u" in the interval (pi, 3pi/2) ,sin(u) = - 1/6. Find the following values exactly. sin(u/2) cos(u/2) tan(u/2) Thanks in advance.
  2. C

    1.) With a triangle, length AB is 130, length BC is 110, and the angle in...

    ...between, B, is 38 degrees.? Find the angle c. Work shown would be appreciated to see what I'm doing wrong.
  3. C

    A communication tower (the side CB) is located at the top (the point C) of a...

    ...steep hill.? he angle of inclination of the hill is 58 degrees. A guy wire is to be attached to the top (the point B) of the tower and to the ground (the point A), 98 m downhill from the base of the tower (the side AC). The angle BAC in the figure is 12 degrees. Find the length of cable (the...
  4. C

    Using the Law of Sines, solve missing lengths with angle of A = 50 degrees,

    length a = 110 and length b = 45.? Solve for the angle of B, angle of C, and length c. Work shown would be nice to see what I am doing wrong.
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