$cos\:x\:=\:-0.49$
$\left(1-p\right)^2$
$\int\frac{x}{x^4-x^3+4x^2-4x}dx$
$\int_0^{\infty}2xe^{3x}dx$
$2^2+3$
$\frac{cosa}{1-sina}-tana$
$-7b^2c-15b^2c-21b^2c-3b^2c$
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