$\left(81a\right)^{\frac{1}{4}}$

$\ln\left(a^2x\right)+\frac{bx}{\sqrt{x}}-\frac{a^3\sqrt{x^2}}{bx}$

$4x^2+20x+25=49$

$\frac{\sec^2\left(x\right)-\tan^2\left(x\right)}{\sec\left(x\right)+\tan\left(x\right)}+\tan\left(x\right)$

$f\left(x\right)=-2x^4+2x^2$

$\int_{\frac{1}{2}}^1\left(\frac{1}{\sqrt{1-x^2}}\right)dx$

$12-1600$