Hyponormality of the sum of two Toeplitz operators

In this paper, we have studied the hyponormality and invertibility of the operator of type $w{T}_{\phi }+T_{\psi }$ where $w$ is any non-zero complex number and $T_{\phi },T_{\psi }$ are Toeplitz operators. We have also studied hyponormality when the symbol of Toeplitz operator is a linear functional.