$\frac{1}{6}\left(42-30x\right)$
$3\tan^2\left(x\right)-4=0$
$x^4+3x^3-x^2-3x$
$3x^2-9x+5x-x^2-x-2x^2$
$\left(2x-5\right)^2=10$
$\frac{1}{1+cos^2x}+\frac{1}{1+\frac{1}{cos^2x}}=1$
$4z+8z$
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