Question

Задача
5соs^2-sin^2=5

Answer 1

Ответ:

x = πk, k∈Z

Объяснение:

$5cos^2x-sin^2x=5\/sin^2x = 1-cos^2x/\5cos^2x -1+cos^2x=5\cos^2x=1\\left { {{cosx=1} atop {cosx=-1}} right. left { {{x=2pi k} atop {x=pi+2pi k}} right. => x =pi k$