(0.87м-0.66м)*10:2:3=0
0.21м*10:2:3=0
2.1м:2:3=0
1.05м:3=0
0.35м=0
м=0:0.35
м=0
удачи))
Sin^4
a + cos^4 a - sin^6 a - cos^6 a = (sin^2 * 2a)/4
Сгруппируем
(sin^4 a - sin^6 a) + (cos^4 a - cos^6 a) = (sin^2 2a)/4
применив тождества 1- sin ^2 a = cos^2 a
1 - cos^2 a = sin^2 a
имеем
sin^4
a (1 – sin^2 a) + cos^4 a (1- cos^2 a) = (sin^2 * 2a)/4
sin^4
a * cos^2 a + cos^4 a * sin^2 a = (sin^2 * 2a)/4
sin^2
a * cos^2 a (sin^2 a + cos^2 a) = (sin^2 * 2a)/4
<span>(4
*sin^2 a * cos^2 a)/4 = (sin^2 * 2a)/4
</span><span>(sin^2
*2 a)/4 = (sin^2 * 2a)/4</span>
<span>Sin2x - 22Cos^2x+10*1 =0
Sin2x - 22Cos</span>²x + 10*(Sin²x + Cos²x) = 0
2SinxCosx -22Cos²x + 10Sin²x +10Cos²x = 0
2SinxCosx -12Cos²x + 10Sin²x = 0
SinxCosx - 6Cos²x +5Sin²x = 0 | : Cos²x
tgx -6 +5tg²x = 0
tgx = t
5t² +t - 6 = 0
D = b² -4ac = 121
t₁ = 1 t₂= -1,2
tgx = 1 tgx = -1,2
x = π/4 + πk , k∈Z x = arctg(-1,2) + πn , n ∈Z