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Find the value of : cos 210^0...

Find the value of : `cos 210^0`

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To find the value of \( \cos 210^\circ \), we can use the cosine addition formula and the properties of the unit circle. ### Step-by-Step Solution: 1. **Express \( 210^\circ \) in terms of known angles**: \[ 210^\circ = 180^\circ + 30^\circ \] ...
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