If tan2a=cot(a+60), find the value of a, where 2a is an acute angle

Here  the answer is 10=a

Step-by-step explanation:

= Tan 2A = cot(A+60°)

= cot(90-2A) = cot (A+60°)

= 90°-2A = A+60°

= 90°-60° =A+2A

= 30 = 3A

= 30\3 = A

= 10 = A

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answer: i think it is (1,-2)

the surface area is 124cm²

step-by-step explanation:

length: 4cm

width: 9cm

height:   2cm