Math, asked by lokesh777ls, 9 months ago

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

Answers

Answered by MrChauhan96
215

\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}}}

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