$3\left(7x+4\right)-5x$
$\cos\left(2x\right)+\cos\left(x\right)\cdot\sin\left(2x\right)$
$p^2=k-s$
$\frac{1}{2}.\sqrt{3x}.2.\sqrt{\frac{1}{3}x}.3.\sqrt{2x}.-2.\sqrt{2x}$
$1+\frac{1+tg^2\:x}{1+\:cotg^2\:x}$
$9b^2-30ab+25a^2$
$f\left(x\right)=\frac{3x^2-5}{\left(3x^2-5\right)^{15}}$
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