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9x2+30x−56=09x^2+30x-56=09x2+30x−56=0
s2−36s^2-36s2−36
−8−[4−(−6−3+5)+(−7)]+3-8-[4-\left(-6-3+5\right)+\left(-7\right)]+3−8−[4−(−6−3+5)+(−7)]+3
105103\frac{10^5}{10^3}103105
240: 3240:\:3240:3
(ab2−10)2\left(ab^2-10\right)^2(ab2−10)2
cos2x−2sin2x+3=2\cos2x-2\sin^2x+3=2cos2x−2sin2x+3=2
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