Question

вычислите sin 111°cos21°-sin21°cos111°​

Answer 1

Ответ:

1

Объяснение:

$sin(a-b)=sina*cosb-cosa*sinb$

sin 111°cos21°-sin21°cos111°​=sin 111°cos21°-cos111°​sin21°=sin(111°-21°)=sin90°=1

Answer 2

$sin111^ocos21^o-sin21^ocos111^o=sin(111^o-sin21^o)=sin90^o=1$