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Which trigonometric expression has a negative value? sin 2π/5 sin 5π/4 sin 2π/3 sin 5π/6​

Which trigonometric expression has a negative value? sin 2π/5 sin 5π/4 sin 2π/3 sin 5π/6​
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Which trigonometric expression has a negative value? sin 2π/5 sin 5π/4 sin 2π/3 sin 5π/6​

User Akdotcom
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Answer:

sin 5pi/4 I'm not sure solve

User KevBurnsJr
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