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Mathematics, 22.06.2019 18:00 jawontestephens

Tangent (π- α) × cos (-π/2 +α) > 0. the answer is that cos α < 0. i forgot to put the negative sign. how do i solve this? does this method also applies to sen(-π/2-α). i get confused when i see questions like these.

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Tangent (π- α) × cos (-π/2 +α) > 0. the answer is that cos α < 0. i forgot to put the negati...

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