solve (cos²48–sin²18)
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Solution:
cos²48 - sin²48
= cos ( 2×48 )
[ Since , cos²x - sin² x = cos 2x ]
= cos 96°
••••
cos²48 - sin²48
= cos ( 2×48 )
[ Since , cos²x - sin² x = cos 2x ]
= cos 96°
••••
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