Identify Chain Rule: We need to find the derivative of sin(7x) with respect to x. According to the chain rule, the derivative of sin(u) with respect to x is cos(u) times the derivative of u with respect to x, where u is a function of x. In this case, u=7x.
Find Derivative of u: First, we find the derivative of u=7x with respect to x. The derivative of 7x with respect to x is 7, because the derivative of x is 1 and 7 is a constant.
Apply Chain Rule: Now, we apply the chain rule. The derivative of sin(7x) with respect to x is cos(7x) times the derivative of 7x with respect to x, which we found to be 7.
Final Derivative: Therefore, the derivative of sin(7x) with respect to x is 7⋅cos(7x).