$1-9a^2b^4$
$t^2+14t=-39$
$-a^2b+\frac{3}{11}a^2b$
$-3a+b-3\left(a+b\right)$
$2\cdot7+9$
$\left(a-b\right)\left(a^4+a^3b+a^2b^2-ab^3+b^4\right)$
$\frac{2\sin\left(a\right)^2}{cos\left(a\right)^2}$
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