$6 ^ { 5 } \times ( 6 ^ { - 2 } ) ^ { 3 }$

$-7+3+2+-7$

$\int150\cdot sec^2x$

$\lim_{x\to0}\left(\frac{x+1}{1+\sin\left(x\right)}\right)^{\frac{1}{x^2}}$

$\left(-7\right)^3\cdot\left(-7\right)^4$

$\int_0^{2\pi}\left(\left(\cos\left(x\right)\right)^2-2.\cos\left(x\right).\sin\left(x\right)+\left(\sin\left(x\right)\right)^2\right)^2dx$

$\int\sec\left(7x\right)\cos\left(7x\right)dx$