Question

упростите 1/tg 3a+sin 3a/1+cos 3a

Answer 1

$frac{1}{tg3a} + frac{sin3a}{1+cos3a} = frac{cos3a}{sin3a} + frac{sin3a}{1+cos3a} = frac{cos3a+cos^23a+sin^23a}{sin3x(1+cos3a)} = \=frac{1+cos3a}{sin3a(1+cos3a)}= frac{1}{sin3a}$