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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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