$3\sin\left(x\right)+\frac{\sin\left(x\right)}{\cos\left(x\right)}$

$\int\frac{\left(a-\ln\left(x\right)\right)}{x}dx$

$6ab+4a-15b-10$

$m.\left(e+b\right)=e.s+b.k$

$6\left(sin\left(x\right)^2\right)+cos\left(2x\right)+1=0$

$\frac{\sec^2x-\tan^2x}{\cos^2x+\sin^2x}$

$3\left(a-5b\right)-\left\{7a-\left[3\left(a-b-2\right)+4\right]\right\}$