$\frac{\sin^2\left(x\right)-2\sin^4\left(x\right)}{1-\sin^2\left(x\right)}$
$\sin\left(90-x\right)=\cos\left(x\right)$
$5.7-4.6$
$6\:\cdot\:-9\:+\:5\:-18$
$\frac{3x^5+2x^2-5}{x^5-3x^3+8}$
$16\cdot611$
$\int\left(2x^3+5x\right)dx$
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