Question

Sim 2A= COSO (A-18) its A. then find Valle​

Answer 1

$\bf{\underline{\underline{Question}}}$

Sin 2A = COS (A-18) . Then find the value of A.

$\bf{\underline{\underline{Solution}}}$

➟$\bf{Sin2A\:=\:Cos(A-18)}$

➟$\bf{Formula:\:[SinA\:=\:Cos(90-A)]}$

➟$\bf{Cos(90-2A)\:=\:Cos(A-18)}$

➟$\bf{\cancel {Cos}(90-2A)\:=\:\cancel {Cos}(A-18)}$

➟$\bf{90-2A\:=\:A-18}$

➟$\bf{90+18\:=\:A+2A}$

➟$\bf{108\:=\:3A}$

➟$\bf{\cancel\frac{108\:}{3}}=\:A$

➟$\bf{36\:=\:A}$

$\bf{\underline{\underline{Thanks}}}$