12. If f(x)=sin(2x+1), then f'(x) is equal to A -2 cos (2x+1). 2 cos(2.x+1). 4 cos(2x+1). C D -4 cos (2x+1). O A Ов Ос O D

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A: Since you have posted multiple questions we will solve the first question for you. If you want any…

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A: cos(2x ) =cos2(x)-sin2(x) = 2cos2(x)-1 =1-2sin2(x) sin(2x) = 2sin(x) cos(x)

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A: Please refer the attached image for complete solution. THANK YOU.

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