5x-1 = 6x-14
(b) Show that AAt and At A are symmetric for any matrix of order 2 x 3.
2 cos^2 2A - 1
\sqrt{\frac{12}{x}-x}+\sqrt{12-x}=\frac{12}{x}
\sqrt{\frac{12}{x}-x}+\sqrt{12-x}-\frac{12}{x}
9x9x9
(x+2)(x+3)(x+6)
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