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theta-varphi=(pi)/(2) then show that [{:...

`theta-varphi=(pi)/(2)` then show that `[{:(cos^(2)theta,costhetasintheta),(costhetasintheta,sin^(2)theta):}][{:(cos^(2)phi,cosphisinphi),(cosphisinphi,sin^(2)phi)]=O`

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