определите знак числового выражения
sin 300 tg 200 cos 100
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cos2
sin 300 tg 200 cos 100
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cos2
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Answers & Comments
tg 200° >0;
cos 100° < 0;
⇒ sin 300 tg 200 cos 100 <0 ( -)
cos2 ≈ cos(2*57,3°) ≈ cos 114° < 0 (-)