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Plz see my question in attached image give me ur fast answer

Plz see my question in attached image
give me ur fast answer

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Grade:11

1 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
4 years ago
Dear student

Sin ( 82.5 ) = cos (7.5)

4 *7.5 = 30
Expanding cos 4x we can obtain cos x

Now sin ( 22.5 ) = sin ( 45/2 )

Expanding sin( 2 x) we can obtain sin x

Substitute values and simplify expression

Regards

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