$1-\cos^2\left(2x\right)$
$\left(5a^3b^2\right)\left(2a^3b^3\right)$
$a^2+\left(-a^2\right)+a^2$
$7^2+\left(4\right)^7$
$10x+2;\:x=6$
$\cos8^{\circ}\cdot\cos22^{\circ}-\sen8^{\circ}\cdot\sen22^{\circ}$
$4x+5<2x-1$
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