2cos67/sin23-tan40/cot50-cos60
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Step-by-step explanation:
2cos67/sin23-tan40/cot50-cos60
=2cos(90-23)/sin23-tan(90-50)/cot50 -cos60
=2sin23/sin23-cot50/cot50-cos60
=2-1-1/2
=1-1/2
=1/2
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