Question

if tan 2A is equal to cos bracket a minus 18 degree bracket close where to a is an acute angle find the value of V

Answer 1

tan 2A =cos (90-(A-18)
=tan 2A=tan(90-A+18)
=2A=108-A
=3A=108
=A=108/3=36

Answer 2

the question should be cot theta not cos theta .

tan2A = cot( A-18)

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

90-2A = A-18

3A= 108

A= 36

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