What is $arctan (- \frac{3}{4})$ $Arctan (-3/4 )$ ?

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Answer 1 · 2015-07-11T21:41:23

$arctan (- \frac{3}{4}) ≅ - 0.6435$ $arctan(-3/4) ~= -0.6435$ (radians) $≅ - {36.87}^{o}$ $~= -36.87^o$

Consider a 3-4-5 triangle. Let $α$ $alpha$ designate the smallest angle in this triangle.

Then:
$arctan (- \frac{3}{4}) = - α$ $arctan(-3/4) = -alpha$

There is no nice expression for $α$ $alpha$ as a multiple of $π$ $pi$ or number of degrees.

What is arctan(−34)Arctan (-3/4 ) ?