Answer:
5. [tex]\frac{\sqrt{2} }{2}[/tex]
7. [tex]\frac{\sqrt{2} }{2}[/tex]
8.[tex]\frac{\sqrt{2} }{2}[/tex]
Step-by-step explanation:
angles in a triangle equal 180 degrees. it is a right angle triangle so one angle is 90 degrees. both the other two are 45 each
5. cos(d)=cos(45)
7. sin(f)=sin(45)
8.cos(f)=cos(45)
