Question

If `cos theta=0.6`, then show that `(5 sin theta-3 tan theta)=0`.

Answer 1

`5 sin theta -3 tan theta =5 sin theta -(3 sin theta)/( cos theta)`
`=sin theta(5-(3)/( cos theta))`
`=sin theta (5-(3)/(0.6)) " " [ because cos theta =0.6]`
`=sin theta(5-(30)/(6))=sin theta(5-5)`
`=sin theta xx 0=0`. [Proved]