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2.1 Very difficult and mean derivatives

Calculate the derivative of the following function and simplify your answer as much as possible.

Reminder:

2 . sin(x) . cos(x) = sin(2x) |

It is possible to simplify further this answer using other trigonometric functions. However we will let you explore that alone,... it is important to be able to do that alone, then please do it !

**You do not know how to do it ? You do not find the way to simplify further that answer ? Ask for help on My Math Forum.**