$7y^3+8y^2-2-6y^3+2y^2+5$

$2\sin^4\left(x\right)-2cos^4\left(x\right)+2cos^2\left(x\right)-2sin^2\left(x\right)$

$\left(x^5\right)\left(4y^5\right)\left(3x^3y^6\right)\left(2y\right)\left(x^4\right)$

$6x^2+4x-2$

$m+6mn-4m-2mn$

$\left(-2\right)\cdot\left(-2\right)\cdot\left(-2\right)\cdot\left(-1\right)$

$9\cdot g+39>84$