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If y=cos(2x+45^@), then dy/dx is...

If `y=cos(2x+45^@)`, then `dy/dx` is

A

`-pi/90^@ sin(2x+45^@)`

B

`2 sin (2x+45^@)`

C

`pi/90^@ sin (2x+45^@)`

D

`-2 sin (2x+45^@)`.

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