trigonometry

Question: If in a triangle $ABC,a=5,b=4,A=\frac{\pi }{2}+B$ , then C

1) Is ${{\tan }^{-1}}\left( \frac{1}{9} \right)$

2) Is ${{\tan }^{-1}}\frac{1}{40}$

3) Cannot be evaluated

4) Is$2{{\tan }^{-1}}\left( 1/9 \right)$

Solution:

Explanation: No Explanation

Relation between sides and angles Solutions of triangles

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