Question

If 2cos^2 A -11cos A + 5 = 0 then find possible
values of cost.​

Answer 1

Answer:

1/2

Step-by-step explanation:

acually it is a quadratic in cosA the roots of the equation are 1/2 and 5. But cos values are always less than 1

2x^2-11x+5=0

2x^2-x-10x+5=0

(2x-1)(x-5)=0

x=1/2(or)x=5

as range of cosA is -1 to 1 x=1/2