Question 519450
Find the EXACT value of the following tanα = -3/4 and α is in Q III and cosβ =-2/sqrt(5) (negative 2 divided by the square root of five) and β is in Q II. I do not think the tangent can be in the 3rd quadrant and still be negative because the opposite over adjacent would make both negative which would turn out positive, and other than that I am still lost.
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You are correct.  The conditions are contradictory.
Cheers,
Stan H.