plz help with trigo?

Question

Express each as a function of 0:
a. sin (270° + 0)
b. cos (π +0)
c. tan (810° +0)
d. sin (0 - 180°)

Answer 1

a. sin 270°
b. cos π
c. tan 810°
d. -sin180°

Answer 2

Yeah, I'm not sure what you mean, but...

sin (270° + 0) = -cos(0)

cos (π +0) = -cos(0)

tan (810° +0) = tan (720° + 90° +0) = tan(90° + 0) = -cot(0)

sin (0 - 180°) = -sin(0)

Is that what you're looking for?