Identify Function: We are asked to find the derivative of the function −cos(x) with respect to x. The derivative of cos(x) with respect to x is −sin(x), according to the basic differentiation rules. Since we have a negative sign in front of cos(x), we will apply the constant multiple rule which states that the derivative of a constant times a function is the constant times the derivative of the function.
Apply Constant Multiple Rule: Applying the constant multiple rule, we differentiate −cos(x) by multiplying the derivative of cos(x) with respect to x by the constant −1.The derivative of cos(x) is −sin(x), so the derivative of −cos(x) is −1×(−sin(x)).
Simplify Expression: Simplifying the expression, we get:−1×(−sin(x))=sin(x).
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