evaluate cot12 cot38 cot52 cot90 cot78
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cot12 cot38 cot52 cot90 cot78
Cot(90-78) Cot(90-52) Cot52. cot90 cot78
Tan78 tan52 cot52 cot90 cot78
Tan78 cot78. Tan52 cot52. Cot90
1 × 1 × cot90
1 × 0
0
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