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(1)
=cos37.cos53-sin53.sin37
=sin(90-37).sin(90-53)-sin53.sin37
=sin53.sin37-sin53.sin37
=0
(2)
=2tan54/cot36-cot80/tan10
=2cot36/cot36-tan10/tan10
=2(1)-1
=2-1
=1
=cos37.cos53-sin53.sin37
=sin(90-37).sin(90-53)-sin53.sin37
=sin53.sin37-sin53.sin37
=0
(2)
=2tan54/cot36-cot80/tan10
=2cot36/cot36-tan10/tan10
=2(1)-1
=2-1
=1
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