Question

Tan 2A = 4cot (A-18) find the value of A

Answer 1

Tan2A= 4cot(A-18)

So

Cot(90-2A)= 4cot(A-18)

Cancelling cot from both sides

90-2A= 4(A-18)

90-2A=4A-72

90+72=4A+2A

162=6A

27=A