Cot12+ cot38. Cot52. Cot60. Cot78
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HEY MATE HERE IS YOUR ANSWER--
(cot12*cot72)(cot38*cot52)cot 60
= {cot12*cot(90-12)}{cot38*cot(90-38) cot 60
= cot 12 * tan 12 * cot 38 * tan 38 *cot60
= 1*1* cot 60
= cot 60
= 1/2
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