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If tan(α) =− 2/5 ; α is in quadrant IV, find cos(α) .

 Sep 26, 2020
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In Q IV   sin is neg    cos is positive

 

tan = sin/cos = -2/5      

   find hypotenuse     h^2 = (-2)^2 + 5^2        h = sqrt 29

        cos = 5/sqrt29     or    5 sqrt29/29

        sin = -2/sqrt 29

 Sep 26, 2020

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