$-29fa^2-10f^2a$
$4800-160x+x^2$
$8m^2-14m-15$
$\frac{27x^61}{3x^2+1}$
$42+\left(4\cdot3\right)-\left(5\cdot7\right)$
$2\left(5y+9\right)$
$\sin^2a+\cos a=1$
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