$\left(a^{-5}\right)^4$
$a^{x-1}b-a^{x-2}b$
$3^{x^2+x-6}=1$
$2x-\left(4x-3\right)+9$
$\sin\left(x\right)^2-\cos\left(x\right)x^2\sin\left(x\right)^2$
$0.66\cdot0.35$
$x^3+8x^2+21x+18$
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