$4a^3-1-1^2+4a$

$18\cdot22$

$\frac{\cos^2\left(a\right)+\sin\:^2\left(a\right)}{\left(\frac{\sin\:\left(a\right)}{\cos\:\left(a\right)}\right)^2+1}=cos^2\:a$

$\int_0^a\left(x\ln\left(x\right)\right)dx$

$m^6-14m^3n^3+49n^6$

$\int\left(e^x\cdot sin\left(6e^x+3\right)\right)dx$

$\left(7m^2\right)^2$