Sin 4A = cos (A- 20°) where 4A is an acute angle find the value of A
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Sin 4A=Cos(A-20)
Sin4A=Sin (90-A+20) (as Cos x= Sin (90-x)
So, 4A=70-A, 5A=70, A=14
Sin4A=Sin (90-A+20) (as Cos x= Sin (90-x)
So, 4A=70-A, 5A=70, A=14
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