$356\cdot3,7$
$7\tan^2\left(x\right)-21\tan\left(x\right)=0$
$\left(x^4-4x^2\right)^3$
$\left(3\cdot\tan^2x-1\right)\left(\tan\left(x\right)-1\right)=0$
$-12\:x\:12$
$sin2\:x\:.\:cos2\:x\:.\:tan2\:x\:=\:sen4\:x$
$y'=\left(4+3x\right)^4$
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