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Evaluate cos 48° cos 42° − sin 48° sin 42°.

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Evaluate cos 48° cos 42° − sin 48° sin 42°.

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=Cos 48°cos 42° – Sin 48° Sin 42° 

=Sin (90° – 48°) sin (90°-42°) – Sin 48° Sin 42° 

=Sin 42° Sin 48° – Sin 48° Sin 42° = 0

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