$y=sin^2\left(x\right)+tan^2\left(x\right)+cos^2\left(x\right)$
$a^2-9a+81$
$\log\left(4x\right)-\log\left(4\right)=\log\left(12\right)$
$\frac{3}{x-4}+\frac{3}{x+4}=\frac{24}{x^2-16}$
$12\cdot10$
$\left(y\right)^'-2y-9=0$
$x^2\le4$
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