$\int_5^{15}ln\left(\left(x-7\right)\right)dx$

$\int_0^{\frac{\pi}{4}}\frac{\left(1+\tan\left(x\right)\right)^2}{cos^2x}dx$

$y=\ln\left(\frac{\left(2x-3\right)^3}{4x}\right)$

$cos=0.45$

$\int1400dz$

$y=x^3a^{-4}$

$\left(\frac{1}{4}+\frac{2}{3}x\right)\left(\frac{1}{4}-\frac{2}{3}x\right)$