$\sin^4a-cos^4a$
$-9\left[-12+\left(4-3\right)-6\right]-7+3-\left(8-5\right)$
$-4-7-1$
$\left(2a\right)^2+2\left(2a\right)\left(-1\right)+\left(-1\right)^2$
$3x-5.4x+1$
$\left(4x^2-3\right)\left(2x^2-5\right)$
$4x^2+\frac{4}{3}x^2+\frac{x^2}{4}$
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