Question

Question number two please....

Answer 1

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Answer 2

Answer:

3/√31

Step-by-step explanation:

lenght of unknown side be x

x^2+6^2=(4√10)^2

x^2+36=160

x^2=160-36

x^2=124

x^2=4*31

x=2√31

√31>√9

2√31>2√9

2√31>6

so cotB=6/2√31

=3/√31