Question

1 - Cos4(x)/Sin^2(4x) помогите пожалуйста

Answer 1

$frac{1-Cos4x}{Sin ^{2}4x }= frac{1-Cos4x}{1-Cos ^{2}4x } = frac{1-Cos4x}{(1-Cos4x)(1+Cos4x)}= frac{1}{1+Cos4x}$