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Problem $03\mathrm{.}020-$ Find the principal normal and shear stresses and the maximum shear stress

The state of stress at a point is ${}_x=-1\mathrm{.}00k,{}_y=20\mathrm{.}00k,{}_x=-10\mathrm{.}00k,{}_{xy}=15\mathrm{.}00k,$

${}_{yx}=4\mathrm{.}000k,$ and ${}_{}=-10\mathrm{.}00k.$

Problem $03\mathrm{.}020.$b $-$ Find the maximum shear stress

What is the maximum shear stress for this case?

The maximum shear stress is

kpsi.