$9.6\:+\:11.5\:-\:21.8+34.7$
$\sec\left(x\right)^4-2.sec\left(x\right)^2.\tan\left(x\right)^2+\tan\left(x\right)^4=1$
$7+11\cdot\left(-10\right)-\left(-66\right)$
$5k-2\left(4k+18\right)=-51$
$-9\cdot13$
$\int\left(a-bx\right)^2dx$
$-x^4y^3-x^2y^2+6xy-2;\:x=-2;\:y=-2$
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