Identify function: Identify the function to differentiate.We are given the function f(x)=−7cos(x)+2 and we need to find its derivative with respect to x.
Apply rules: Apply the derivative rules.The derivative of a constant is 0, and the derivative of cos(x) with respect to x is −sin(x). We will use these rules to differentiate each term of the function.
Differentiate first term: Differentiate the first term.The first term is −7cos(x). The derivative of cos(x) is −sin(x), so the derivative of −7cos(x) is −7 times the derivative of cos(x), which is −7(−sin(x))=7sin(x).
Differentiate second term: Differentiate the second term.The second term is a constant, 2. The derivative of a constant is 0, so the derivative of 2 with respect to x is 0.
Combine derivatives: Combine the derivatives of the terms.The derivative of the function f(x)=−7cos(x)+2 is the sum of the derivatives of its terms, which is 7sin(x)+0.
Simplify result: Simplify the result.Since adding 0 does not change the value, the final derivative of the function is simply 7sin(x).
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