cot 12 + cot 38 × cot 52 into cot60×cot 78
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Answer:This arrangement can be rearranged as :
(cot12*cot72)(cot38*cot52)cot 60
= {cot12*cot(90-12)}{cot38*cot(90-38) cot 60
= cot 12 * tan 12 * cot 38 * tan 38 *cot 60
= 1*1* cot 60
= cot 60
= 1/2
Step-by-step explanation:
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