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a₁₁= cos1π= -1 a₁₂=sen1π= 0
a₂₁= cos2π= 1 a₂₂=cos2π= 1
a₃₁= cos3π= -1 a₃₂=cos3π= -1
a) A=![\left[\begin{array}{ccc} -1&0\\1&1\\-1&-1\end{array}\right]](https://tex.z-dn.net/?f=++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D+-1%26amp%3B0%5C%5C1%26amp%3B1%5C%5C-1%26amp%3B-1%5Cend%7Barray%7D%5Cright%5D+ "\left[\begin{array}{ccc} -1&0\\1&1\\-1&-1\end{array}\right]")
b) A
=![\left[\begin{array}{ccc}-1&1&-1\\0&1&-1\\\end{array}\right]](https://tex.z-dn.net/?f=++++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D-1%26amp%3B1%26amp%3B-1%5C%5C0%26amp%3B1%26amp%3B-1%5C%5C%5Cend%7Barray%7D%5Cright%5D+ "\left[\begin{array}{ccc}-1&1&-1\\0&1&-1\\\end{array}\right]")
a₂₁= cos2π= 1 a₂₂=cos2π= 1
a₃₁= cos3π= -1 a₃₂=cos3π= -1
a) A=
b) A
LiahHale:
OK. Mas vc não vai me explicar? :|
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