$a=2,b=3,c=4$
$\left(4ab+7c\right)\left(ab+6c\right)$
$-\frac{\cos^2\left(x\right)}{\sin\left(x\right)}=0$
$3sin^2x-5sinx+2=0$
$\lim_{x\to0}\left(1+6x\right)^{\frac{3}{x}}$
$\left(2x^5+5x-3\right)\left(4x-3x^2+2x^3\right)$
$1-tan^225+csc^265$
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