Can someone me verify each identity, i dont know how

see explanation

Step-by-step explanation:

using the trigonometric identities

I have used x instead of theta

• sin²x + cos²x = 1

• secx = and tanx =

consider the left side

+

Combine the fractions

=

=

= = secx = right side → verified

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6