Question

If O is a positive angle and 4 cos2 0 - 4 cos
0 + 1 = 0, then the value of tan (0 - 30°) =​

Answer 1

Step-by-step explanation:

put cos0 = x...

then it will transform into a quadratic equation...

4x²-4x+1=0

you will get x = 1/2

i.e cos0= 1/2

i.e 0 =60°

so tan(60°-30°) = tan 30° = 1/√3