Cos²48-sin²12=√5+1/8
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Answered by
18
Hiiii....
Identity :
cos^2 A - sin^2 B = cos ( A+ B) .cos ( A -B ) ....
cos^2 48 - sin^2 12 = cos60 . cos 36
= 1/ 2 × (root5 + 1 )/4 ...
=
Proved.....
Identity :
cos^2 A - sin^2 B = cos ( A+ B) .cos ( A -B ) ....
cos^2 48 - sin^2 12 = cos60 . cos 36
= 1/ 2 × (root5 + 1 )/4 ...
=
Proved.....
Answered by
0
Step-by-step explanation:
this is hence proved...
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