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If A=((a(i j)))(nxxn) and f is a functio...

If `A=((a_(i j)))_(nxxn)` and `f` is a function, we define `f(A)=((f(a_(i j))))_(nxxn ')` Let `A=(pi//2-thetatheta-thetapi//2-theta)` . Then `sinA` is invertible b. `sinA=cos A` c. `sinA` is orthogonal d. `sin(2A)=2AsinA cos A`

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