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Aluno
Determine os valores de: a) y=3cos540∘−2sen90∘+tg180∘y=3 \cos 540^{\circ}-2 \operatorname{sen} 90^{\circ}+\operatorname{tg} 180^{\circ}y=3cos540∘−2sen90∘+tg180∘ b) y=4sen900∘−2cos630∘+sen720∘y=4 \operatorname{sen} 900^{\circ}-2 \cos 630^{\circ}+\operatorname{sen} 720^{\circ}y=4sen900∘−2cos630∘+sen720∘
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