1.

Cos20×cos100+cos100×cos140-cos140×cos200

Answer»

Here FRIEND's your may be this:
not sure but follow:
(20+100)+cos100*140-cos140*cos200
=(120*100)*(140/140)*cos 200.
=12000*1*cos200.
=12000+200.
=12200.Ans//
hope it HELPS you a lot



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