Answer: 
Step-by-step explanation:
Given
Vertical distance between two helicopters is 300 ft
angle of depression is 
Suppose the distance between the helicopters is d
from the figure, we can write

Y=Mx+b m is the slope and b is the y intersect so where x hits 0
Double angle formulae involve trigonometric functions of double angles and in order to get its value you must consider the following:
-derive the double angle formula from additional formula
-write the formula for the angle in alternative form
-use the formula to write trigonometric expressions in different forms
-use the formula in the solution of trigonometric equations
And the answer would be 4sin(theta)cos(theta)cos(2theta)
Answer:
72
Step-by-step explanation:
i think