Problem 2. Convert the angle  𝜃 = − 1 2  from radians to degrees. (A)  − 90 ∘ (B)  90 ∘ (C)  − ( 90 𝜋 ) ∘ (D)  ( 90 𝜋 ) ∘ (E)  − ( 180 𝜋 ) ∘单项选择题

A

A

B

B

C

C

D

D

E

E

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