$cos^4x=1-2sin^2x+sin^4x$
$50d^2+220d+242$
$2-cos^2x$
$\left(x+1\right)^2=100$
$82-45$
$\int\left(\tan\left(3x\right)\cdot\sqrt{\sec\left(3x\right)}\right)dx$
$x^2\cdot\frac{dy}{dx}=y-x\cdot y$
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