$4-2x-1+4x$
$\frac{\sec^2\left(a\right)-1}{\sec\left(a\right)}$
$-17-40$
$\left(t^2+36\right)\frac{dy}{dx}=\left(x^2+9\right)$
$ln\left(tanx\right)=ln\left(sinx\right)+ln\left(secx\right)$
$\cos\left(x\right)\sin\left(x\right)=-7\sin\left(x\right)$
$\left(x^3+4\right)\left(x^3-8\right)$
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