Question

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Answer 1

Answer:

option C................

Answer 2

Answer:

Ans (C)=2π/3

Step-by-step explanation:

let x=cos⁻¹(-1/2)

so cos x=-1/2

and -1/2 =cos (90°+30°)

=( π/2+π/6) Radian

so x= π/2+π/6) Radian

=(4π/6)

=2π/3

Ans (C)