If cos 330=√3/2 then find sin 165 = √3-1/2√2
Answers
Step-by-step explanation:
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The value of sin 165° is √( 2 - √3 ) /2.
Given: cos 330° = √3/2
To Find: sin 165°
Solution:
We shall make use of a trigonometrical identity to solve the numerical. The identity is;
...(1)
Where A = angle.
Coming to the numerical, we are given;
cos 330° = √3/2
Applying formula (1), we get;
cos 330° = 1 - 2 sin² ( 330° / 2 )
⇒ cos 330° = 1 - 2 sin² 165°
⇒ sin² 165° = ( 1 - cos 330° ) / 2
⇒ sin² 165° = ( 1 - (√3/2 )) / 2
⇒ sin² 165° = ( 2 - √3 ) / 4
⇒ sin 165° = √[( 2 - √3 ) / 4]
⇒ sin 165° = √( 2 - √3 ) /2
Hence, the value of sin 165° is √( 2 - √3 ) /2.
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