$-5\left(b+3d\right);\:b=6;\:d=-1$
$a=\cos^{2}x\cdot\tgx-\sen^{2}x\cdot\cot gx$
$2y-3y^2z$
$70.0856+0.000012+0.00006+0.00005+0.00004+0.000022$
$\sin^2x\sec x-\sec x=-\cos x$
$\cos\left(2x\right)+\sqrt{3}\cdot\sin\left(2x\right)=1$
$\int\:4\:cos\:\frac{x}{3}dx$
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