$\:\:\left(2x+5y^2\right)\left(2x-5y^2\right)$
$4\cdot2^2-2^2-7\cdot2-5$
$2\cdot\cos^2x+\sin^2x+\sin^2x\cos^2x=1$
$\left(-7\right)^{21}$
$\int\frac{20x^2}{\sqrt{9-x^2}}dx$
$-4+6+-14+7+-42+4$
$64x\:^2-128x+64\:\:\:\:\:\:$
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