$f\left(x\right)=0.23\ln x+0.46$

$\frac{\left(-14\right).\left(-3\right)}{\left(-7\right)}\:\:\:\:\:\:\:\:\:\frac{\left(+16\right).\left(-2\right)}{\left(+8\right)}$

$\int\frac{sin\sqrt{x}cos\sqrt{x}}{\sqrt{x}}\:dx$

$y^4+y^2=0$

$\frac { x ^ { 2 } - 36 } { x - 6 }$

$-7-7\cdot3$

$\lim_{x\to-3}\left(\frac{x^2+5x+6}{x^2-x+12}\right)$