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Mathematics, 22.06.2019 18:30 babyari18

Tangent (π- α) × cos (π/2 +α) > 0. the answer is that cos α < 0. can someone explain why?

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Tangent (π- α) × cos (π/2 +α) > 0. the answer is that cos α < 0. can someone explain why?...
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