$8^2-81$
$4\cos\left(2x\right)=3$
$2\sin\left(x\right)-1=5$
$\frac{\frac{cos^2x}{sin^2x}}{sec^{2x}}$
$\frac{6x^3+5x^2-19x-10}{1}$
$x^2-10x-5=0$
$64x^2+80x-25$
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