$87j+21k-12j+23j+8k$
$x^2+6x+9=55$
$\left(\left(y-1\right)\left(y+1\right)\left(y^2+1\right)\right)^3$
$tg\:x\:+\left(1\:+\:cos\:x\right).\:cosec\:x=\:tg\:x\:+cotg\:x\:+cosec\:x$
$\frac{dx}{dt}=3xt^2-3t^2$
$\:\:24xyz^2+30y$
$0.7-1.9444444$
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