$6a-4-15a^2$

$-6<\frac{2x-3}{4}$

$2cos^2x+4=5-cosx$

$-7\left(x+9\right)\left(x+10\right)$

$-\left\{+\left\{6+\left[-\left(7\right)-\left(-12\right)\right]-13\right\}\right\}$

$\int\left(w.cot^5\left(w^2\right)\right)dw$

$5sin\left(95^{\circ}\:\right)cos\left(140^{\circ}\right)$