$sen\left(x\right)+cos\left(x\right)=\sqrt{2}$
$\frac{\cos\left(x\right)}{1+\cos\left(2x\right)}=\frac{1}{2\cos\left(x\right)}$
$25x^2+16<40x$
$\left(6\right)\left(-2\right)\left(-10\right)\left(-5\right)$
$144a^2+4b^2-48ab$
$2x+6x-5=x+3x-1$
$-8-9-16-1+34$
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