Problem $3(10$ pts$)$

Consider Fig. $4$ and assume $1kp=1N.$ Determine

$($a$)$ The reactions at $D$ and $E.$ Give the results in the reference frame $E\{hat(e{)}_1,$hat$(e{)}_2\}$ where hat$(e{)}_1$ points horizontally to the right, and hat$(e{)}_2$ points vertically upwards. $(5$ pts$)$

$($b$)$ The forces in all the members of the truss. Specify whether they are in tension or compression. $(5$ pts$)$