$\left(4-\frac{9}{2}\right)^2$
$\sin\left(2a\right).\cos\left(a\right)-\sin\left(a\right).\cos\left(2a\right)=\sin\left(a\right)$
$5x\:-\:xy^2$
$4y^2+8xy$
$\frac{2}{h+7}\:=\:\frac{-1}{h+10}$
$1+\frac{-4x-3}{3+x^2}.8$
$27=15+n$
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