$y=\left(x^2-3\right)^{-2}$
$\cos^2a-\sin^2a=\frac{1}{1+2\sin a.\cos a}$
$5x^2+13x-6=0$
$\frac{1.1}{2}$
$10\left(a^2+2\right)+5\left(a^2+2\right)-15\left(a^2+2\right)$
$100-35.758$
$25a^2-04a-36a^2+4a-1$
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