if sin 2A = Cos ( A+30 ) where 2A is an acute angle, then A= ————

sin and cos are complementary
i.e. sin(A)=cos(90-A)

sin(2A)°= cos(A+30)°
cos(90-2A)°=cos(A+30)°
(90-2A)°=(A+30)°
60°=3A°
A°=20°

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