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Question
The value of sin (-420°)
Options
`sqrt3/2`
`- sqrt3/2`
`1/2`
`- 1/2`
MCQ
Solution
`- sqrt3/2`
Explanation:
sin(-420°) = -sin(420°) [∵ sin(-θ) = -sin θ]
= -sin(360° + 60°)
= -sin 60°
= `- sqrt3/2`
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Trigonometric Ratios of Compound Angles
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