$cos4x\:cos5x\:-\:sin4x\:sin5x$
$\int\sin^{-1}\left(x\right)d\cdot$
$16+15x+25$
$11x^3+11x^2+11x^2-11$
$0.25+-1.75$
$\frac{3}{5}\int\left(\sin9x\right)dx$
$\frac{-5x^2-x^4+x^2-2}{x^2+1}$
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