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Sin A=Cos A implies A=45 degress Cos 2A= Cos 2(45)=Cos 90=0
Ans : 0
Use the the formula. cos (A+B) = cos A cos B - Sin A Sin B
So in our case : cos 2A = Cos (A + A) = cos A cos A - sin A sin A since: cos A = sin A so = cos^2 A - cos^2 A = 0
Sin A = Cos A
Divide by Cos A gives us Tan A = 1 i.e. A is 45
so Cos 2A is Cos 90 which is zero
So in our case : cos 2A = Cos (A + A) *Sin A = CosA ** implies A=45 degress Cos 2A= Cos 2(45)=Cos 90=0 so the right answer is zero(0)
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