Question

Решите уравнение:
sin4x=-cos5x

Answer 1

in4x=4 sinx cosx (cos^2 x - sin^2 x) cos 4x=1-4sin^2 x cos^2 xsin 5x=sin 4x cos x + cos 4x sin xcos 5x=cos 4x cos x - sin 4x sin x