4*cos2α*sinα*cosα = 2 * (2*sinα *cosα) *cos2α = 2 * sin 2α * cos 2α = sin4α
(cosα + cos 3α) / (sin 3α - sinα) = 2*cos2α*cosα / 2*cos2α*sinα) = cosα / sinα = ctg α
- + - +
______________-14___________-7______________0____________
x∈[-14;-7]∨[0;+∞)
400*5/100=400*0.05=20
75*0.2=15
16*0.5=8
40*0.75=30
240*1.5=360
35*0.07=2.45
1)(6а-13б)*(6а+13б)
2)(5x+8y)(5x-8y)-80xy (неуверена)
3)(5x+3b)(25x^2-15xb+9b^2)
Loq7 2 = 1/Loq2 7 < 1/ Loq2 6 = Loq6 2.
Loq7 2 < Loq6 2 .