$1-81y^4$
$49\cdot28$
$\left(7x+5y\right)\left(49x^2-35xy+25y^2\right)$
$6x^2-24x$
$5x\:+\:36\:=\:7x\:-\:6$
$\lim_{x\to0}\left(\frac{\sec x-1}{\cos x-1}\right)$
$4bx\cdot\frac{dx}{db}=x^2+1$
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