Without using a calculator write down in degrees, where possible, the principal value of a) sin 0 b) sin (1) c)

Without using a calculator write down in degrees, where possible, the principal value of

a) sin⁻¹ 0 

b) sin⁻¹ (−1)

c)

d)

e) cos⁻¹ 1

f)

g) cos⁻¹2

h) cos⁻¹ (−1)

i) tan⁻¹ 1

j) tan⁻¹ 0

k)

l)

sin- 2