SOLUTION: (tough) suppose " pi/2 < 0 < pi " and " sin X = 5/16 "... Evaluate "cos X"

Algebra ->  Trigonometry-basics -> SOLUTION: (tough) suppose " pi/2 < 0 < pi " and " sin X = 5/16 "... Evaluate "cos X"      Log On


   

Question 281079: (tough) suppose " pi/2 < 0 < pi " and " sin X = 5/16 "... Evaluate "cos X"
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Not so tough.
Remember
%28sin%28x%29%29%5E2%2B%28cos%28x%29%29%5E2=1
You know sin(x), solve for cos(x), then use the limits to make the choice for x.