Формулы приведения
Помогите, пожалуйста
sin1050°-cos(-90)+ctg660°

Варианты ответа:
1. [tex]- \frac{ 3\sqrt{3} }{2} [/tex]
2. [tex]2 \sqrt{3} [/tex]
3. [tex]- \frac{3+2 \sqrt{3} }{6} [/tex]
4. [tex]0,5+ \sqrt{3} [/tex]
5. [tex] \sqrt{3}-1[/tex]
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