SOLUTION: If cos0=1/4 what is the value os in 0? Assume that 0 is an angle in the first quadrant

Algebra ->  Trigonometry-basics -> SOLUTION: If cos0=1/4 what is the value os in 0? Assume that 0 is an angle in the first quadrant      Log On


   

Question 1036034: If cos0=1/4 what is the value os in 0? Assume that 0 is an angle in the first quadrant
Found 2 solutions by Aldorozos, ikleyn:
Answer by Aldorozos(172) About Me  (Show Source):
You can put this solution on YOUR website!
I believe there is a typo. My guess is that you are looking for an angle that it's cos is 1/4
To find answer, you may access this link
http://www.rapidtables.com/calc/math/Arccos_Calculator.htm
In the text box that says arc is type .25 and you will get an angle around 75. If the link above doesn't open, you may go to google and type arc is and search for a site that allows you to type .25 and then search for the angle.

Answer by ikleyn(52921) About Me  (Show Source):
You can put this solution on YOUR website!
.
If cos0=1/4 what is the value os in 0? Assume that 0 is an angle in the first quadrant
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The formulation has typos.
Let me reformulate (and solve) it as it should be. 

--------------------------------------------
   If  cos%28theta%29 = 1%2F4  what is the value of sin%28theta%29 ?

   Assume that theta is an angle in the first quadrant.
--------------------------------------------


Solution

If  cos%28theta%29 = 1%2F4  then  sin%28theta%29 =  sqrt%281+-+cos%5E2%28theta%29%29 = sqrt%281+-+%281%2F4%29%5E2%29 = sqrt%281+-+1%2F16%29 = sqrt%28%2816-1%29%2F16%29 = sqrt%2815%2F16%29 = sqrt%2815%29%2F4.

The sign  "+"  was chosen at the square root because the sine is positive for an angle at the first quadrant.