The London Eye is the major feature of London’s skyline. It consists of thirty-two capsules each holding up twenty-five people. The British Museum is one of the most famous museums in the world with the richest collections. It exhibits man works from all over the world from prehistoric period to modern times. The greatest Tower of London is one of the world’s most famous buildings. Tate Modern in London is a famous Britain’s national museum of contemporary and modern art. It stands on the banks oа Thames and has a unique shape (previously it was a power station). Westminster Abbey also knows as Collegiate Church of St. Peter is a Gothic church on the scale of a cathedral. Westminster Abbey has been the traditional place of coronation and burial for English monarchs for a long time.
x = π*n , n∈Z
x = -π/4 +π*k , k∈Z
Объяснение:
Используем формулу понижения степени :
sin^2(t) = (1-cos(2t) )/2
( (1-cos(2x) )/2)^2 + ( ( 1-cos(2x +π/2) )/2)^2 = 1/4
Умножаем на 4 обе части уравнения, учитывая, что
cos(2x +π/2) = -sin(2x)
(1-cos(2x) )^2 +(1+sin(2x) )^2 = 1
1 -2*cos(2x) +cos^2(2x) +1+2*sin(2x) +sin^2(2x) = 1
Поскольку : cos^2(2x)+sin^2(2x) = 1
-2*cos(2x)+2*sin(2x) = -2
cos(2x) -sin(2x) = 1
√2/2 *( cos(2x) -sin(2x) ) =√2/2
cos(2x+π/4) = √2/2
2x+π/4 = +-π/4 +2*π*n , n∈Z
x+π/8 = +-π/8 +π*n, n∈Z
x = π*n , n∈Z
x = -π/4 +π*k , k∈Z