$\left(3a^{x+2}\right)\left(4a^{x+1}\right)$
$1-\sin^2$
$\frac{x^4-\:y^4}{x-y}$
$3x^2+3x+75$
$\left(sin\:2a\:+\:cos\:2a\right)^2\:-\:1\:=\:sin4a$
$x^4-10x^2y^2+25x^4y^4$
$\left(+10\right)-\left(-4\right)$
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