solve the equation 4cos^2x-1=0

1 answer

cos^2x = 1/4
cosx = ± 1/2

do you know an angle x , so that cosx = 1/2 ???
and by the CAST rule, isn't that angle in any of the 4 quadrants?

hint: cos60° = 1/2
Similar Questions
  1. 1)Solve;2x+1/6=1/2x2)Solve for y in the equation;6y-4/3-2y-1/2=6-5y/6. 3)Solve the equation: 4 sin^2titre+4cos titre=5 for 0°
    1. answers icon 1 answer
    1. answers icon 1 answer
  2. solve the equation1+4sin(x)=4cos^2(x)
    1. answers icon 2 answers
    1. answers icon 1 answer
more similar questions