4−2x−x−17+164-2x-x-17+164−2x−x−17+16
(5x−6y)(5x+6y)\left(5x-6y\right)\left(5x+6y\right)(5x−6y)(5x+6y)
(+21) − (−20)\left(+21\right)\:-\:\left(-20\right)(+21)−(−20)
x − 2y − 4z = 0 \:x\:-\:2y\:-\:4z\:=\:0\:\:x−2y−4z=0
(sec(a)+tan(a)).(1−sin(a))=cos(a)\left(\sec\left(a\right)+\tan\left(a\right)\right).\left(1-\sin\left(a\right)\right)=\cos\left(a\right)(sec(a)+tan(a)).(1−sin(a))=cos(a)
1cos3x\frac{1}{cos^3x}cos3x1
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