4Cos6.cos42.cos60.cos66.cos78=
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ANSWER :
LHS
-COS 6 COS 42 COS66 COS 75
=1 BY 2 (COS 72+COS 60
WHERE2
cos 42 COS 78 =(1BY 2) (COS 36+COS 120 )
=3 BY 8;
Step-by-step explanation:
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