Use an appropriate half-angle formula to find the exact value of the expression. cos(13i/8)

can i know which language is this?

the answer to this in exact form is 4/35 but in decimal form its 0.1142857

hope this if needed hmu

measurement of the swimming pool is given as = 7 yards 4.79 feet

first we will convert this to yards only.

1 foot = 0.33 yards

so, 4.79 feet = yards

so total yards are = yards

now we will convert this in meters.

1 yard = 0.914 meters

8.580 yards = meters

0.842 m = 0.842*100 = 84.2 cm

this becomes 7 meters and 84.2 cm

hence, the pool is 7 meters and 84.2 cm wide.