If A=[costheta-sinthetasinthetacostheta]...

If `A=[costheta-sinthetasinthetacostheta]` , then `A^T+A=I_2` , if `theta=npi,\ \ n in Z` (b) `theta=(2n+1)pi/2,\ \ n in Z` (c) `theta=2n\ pi+pi/3,\ \ n in Z` (d) none of these

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