what is the value of (cos2 67°-sin2 23°)
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I got ans 0 as cos(2 )67 will change into sin(2)23
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( ( cos (90- 67))^2 - sin ^2 23 )
(sin^2 23 - sin^2 23)
=0
(sin^2 23 - sin^2 23)
=0
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