Question

Помогите с тригономтрией! sint / (1+cost) + sint / (1-cost)

Answer 1

$displaystyle frac{sin t}{1+cos t}+ frac{sin t}{1-cos t}= frac{sin t(1-cos t)}{sin^2t} + frac{sin t(1+cos t)}{sin^2t}=\ \ \ = frac{sin t-sin tcos t+sin t+sin tcos t}{sin^2t}= frac{2sin t}{sin^2t}= frac{2}{sin t}$