Question

If sec a + cos a = 5/2, then find sec a - cos a ?

Answer 1

`(seca-cosa)^2=(seca+cosa)^2-4secaxxcosa`

`=>(seca-cosa)^2=(5/2)^2-4xx1`

`=>seca-cosa=sqrt(25/4-4)=sqrt(9/4)=3/2`