$\cos^2\left(19\right)-\sin^2\left(19\right)$
$15-1600$
$7x^2y\cdot6x^4-10x^2y^2+11y^3$
$64b^2-80b+36$
$3a^3\:b\:c^2\:cuando\:a=2\:b=-1\:y\:c=3$
$x^3\:dy\:+\:xy\:dx\:=\:x^2\:dy+2y\:dx$
$\lim_{x\to0}\left(1+5x\right)^{\frac{11}{x}}$
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