$10ab-6b$
$8\cdot\left(+36\right)$
$sin\left(4x\right)=4sin\left(x\right)cos\left(x\right)\left(1-2sin^2x\right)$
$\frac{1-2sin\left(x\right)+sin^2\left(x\right)}{1-sin^2\left(x\right)}=\frac{1-sin\left(x\right)}{1+sin\left(x\right)}$
$\lim_{x\to0}\left(\frac{sin\:\left(x\right)-\:sin\:\left(h\right)\left(x\right)}{cos\:\left(x\right)-cos\left(h\right)\left(x\right)}\right)$
$\int2x^2\cdot\cos\left(mx\right)dx$
$am-2m+an-2n$
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