Question

+Evaluate cos 48° cos 42° – sin 48° sin42°​

Answer 1

cos 48° cos 42° – sin 48° sin42°​

=cos (90°–42°) cos42° – sin48 sin(90°–48°)

=sin48° cos42° – sin48° cos42°

=1

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Answer 2

this is required solution.....hope this helps you.....thankyou