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Question

If A + B = 225, then cotA1+cotA.cotB1+cotB=

A
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B
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C
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Solution

The correct option is A
Given A+B=225cotAcotB1cotA+cotB=1cotAcotB=1+cotA+cotB
2cotAcotB=1+cotA+cotB+cotAcotBcotA1+cotAcotB1+cotB=12

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