Use trigonometric identities to transform the left side of the equation into the right side (0 < θ < π/2).
sin2 θ − cos2 θ = sin2 θ −
= 2 sin2 θ − 1

d

step-by-step explanation:

$4034.40

the perimeter of the field is the sum of the lengths of the four sides:

47 yd + 158 yd + 47 yd + 158 yd = 410 yd

the cost of 3 ft (1 yd) of fence is 3×$3.28 = $9.84.

so the cost of jake's wood perimeter fance is

(410 yd) × ($9.84 /yd) = $4034.40