Use an identity to find the value of expression. sin 40° csc 40°

Step-by-step explanation:

1. sin37xcsc37

For this use the recipricol identity. csc37 = 1/sin37

sin37x (1/sin37) = (sin37) / (sin37) = 1

2. sec^2 (23) - tan^2 (23)

For this one use the pythagorean identity

sec^2 (23) = 1+tan^2 (23)

1+tan^2 (23) - tan^2 (23) = 1