Answer:
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
