Evaluate:
cot12 ⋅ cot38 ⋅ cot52 ⋅ cot60 ⋅ cot78
cot(90–78).cot(90–52).cot52.
.cot78
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) — sin(50 + 
) + 
+ 
+ √3 (tan10 tan30 tcm40 tan50 tan80–
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