$secbeta\left(1+cosbeta\right)\left(1-cosbeta\right)$
$-64\::4\cdot5-37$
$1-cos\left(2x\right)cos\left(2y\right)$
$1-4x+4^2$
$3x-8>x+2$
$f\left(x\right)=\left(7x-4\right)^3\cdot\left(7x^2+6\right)^5$
$f\left(x\right)=\:ln\:\:1+\sqrt{1+3x}$
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