$4\sin^2\left(x\right)-2\sin\left(x\right)\:=\cos\left(2x\right)+2\sin^2\left(x\right)$
$\frac{5}{x}\:x\:\frac{2x}{y^2}\:x\:\frac{3y}{10}$
$cot\left(-a\right)=-cot\left(a\right)$
$2x\:-\:7\:=\:-9$
$2\:-\:4cos^2\left(x\right)\:=\:0$
$\left(d+a\right)^4$
$x^2\:<8xy$
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