Correct Answer: Option A

Explanation

Cos25º - Sin 25º

The differentiation of a constant = 0, But based on the Options provided

Cos 25º when differentiated = -Sin 25º and Sin25º = + Cos25º

Putting these together, we have - Sin25º - Cos25º = - ( Sin25º + Cos25º)  

There is an explanation video available below.

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