Evaluate sin(2pi/3)

We have to evaluate the value of sin 2∏/3

Solution

sin 2∏/3 can be expressed as

sin (∏ – 2∏/3)

= sin (3∏-2∏ / 3)

= sin ∏/3

= sin 60

We have learnt that sin 60 = √3/2

Answer

sin 2∏/3= √3/2

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