Ответ:
Применяем формулы приведения .
[tex]\bf 10\, sin150^\circ +19\, cos120^\circ +12\, tg135^\circ =\\\\= 10\, sin(180^\circ -30^\circ )+19\, cos(180^\circ -60^\circ )+12\, tg(180^\circ -45^\circ )=\\\\= 10\, sin30^\circ -19\, cos60^\circ -12\, tg45^\circ =\\\\=10\cdot \dfrac{1}{2}-19\cdot \dfrac{1}{2}-12\cdot 1=5-9,5-12=-16,5[/tex]
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Ответ:
Применяем формулы приведения .
[tex]\bf 10\, sin150^\circ +19\, cos120^\circ +12\, tg135^\circ =\\\\= 10\, sin(180^\circ -30^\circ )+19\, cos(180^\circ -60^\circ )+12\, tg(180^\circ -45^\circ )=\\\\= 10\, sin30^\circ -19\, cos60^\circ -12\, tg45^\circ =\\\\=10\cdot \dfrac{1}{2}-19\cdot \dfrac{1}{2}-12\cdot 1=5-9,5-12=-16,5[/tex]