Solve the Equation for Solutions Over the Interval [0 $[ 0,2 \pi )$

Solve the equation for solutions over the interval [0, $[ 0,2 \pi )$ ) . Write solutions as exact values or to four decimal places, as
appropriate.
-It can be shown that if the angle of elevation from an observer to the top of an object is $\mathrm { A }$ and the an: elevation $\mathrm { d } \mathrm { ft }$ closer is $\mathrm { B }$ , then the distance from the object to the closest point of observation is given $\mathrm { D } = \frac { \mathrm { d } \cot \mathrm { B } } { \cot \mathrm { A } - \cot \mathrm { B } } \mathrm { ft }$ .
Find $\mathrm { B }$ if $\mathrm { D } = 70 \mathrm { ft } , \mathrm { d } = 30 \mathrm { ft }$ , and $\mathrm { A } = 39 ^ { \circ }$ . Give your answer in degrees to the nearest hundredth.

A) $39.00 ^ { \circ }$
B) $49.16 ^ { \circ }$
C) $19.14 ^ { \circ }$
D) $69.67 ^ { \circ }$ ngle of451)