Question

решите уравнение cos4x*sin3x+sin4x*cos3x=1

Answer 1

sin(3x)*cos(4x) + sin(4x)*cos(3x)≡ sin(3x+4x)≡ sin(7x)
sin(7x) = 1,
7x = (п/2) + 2п*n, n∈Z,
x = (п/14) + (2п*n/7).