$1-tan^2a=cos2a.sec^2a$
$x+7=-22$
$\left(+6\right).\left(+7\right)+10-4$
$5k^6\cdot4k^{-6}$
$\frac{\left(5x^2-2\right)sinx}{sinx+6}$
$\int\:t^3in\left(2t\right)dt$
$\frac{d}{dx}y=x^{sin3x}$
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