Question

sin2d/1-cos2d срочно ​

Answer 1

sin1d=cos1d

cos1d-sin2d=cos2/1sin2d

Answer 2

Ответ:

ctgd

Объяснение:

$frac{sin2d}{1-cos2d}=frac{2sind*cosd}{1-(cos^2d-sin^2d)}=frac{2sind*cosd}{1-cos^2d+sin^2d}=frac{2sind*cosd}{(1-cos^2d)+sin^2d}=frac{2sind*cosd}{sin^2d+sin^2d}=frac{2sind*cosd}{2sin^2d}=frac{cosd}{sind}=ctgd$