The stresses of a gear shaft at the position of the maximum load $(=$boundary fibre at the point of the maximum bending stress$)$ are extreme values of normal and shear stress $({}_{\text{m}\text{a}\text{x}}$;${}_{\text{m}\text{i}\text{n}}$;$|{|}_{\text{m}\text{a}\text{x}})$ and their orientation $(=$angle to the ${}_b-$axes$)$ with the help of Mohr's Circle. What are the stresses ${}_x^{**}$;${}_y^{**}$;${}_{xy}^{**}$ at an angle of $=45$ to the ${}_b-$axes? Check the results using the formulars! What are the equivalent stresses ${}_{\text{e}\text{q}\text{N}}($Tensile Stress Hypothesis$),{}_{\text{e}\text{q}\text{s}}($Shear Stress Hypothesis$),{}_{\text{e}\text{q}\text{v}\text{M}}($van Mises Criterion$)?$