Recall definition of cosecant function: Recall the definition of the cosecant function and its derivative. The cosecant function is defined as csc(x)=sin(x)1, and its derivative with respect to x is given by dxdcsc(x)=−csc(x)cot(x). We will use this information to find the derivative of y=−csc(3x) with respect to x.
Apply chain rule to differentiate: Apply the chain rule to differentiate y=−csc(3x). The chain rule states that the derivative of a composite function f(g(x)) is f′(g(x))g′(x). In this case, f(x)=−csc(x) and g(x)=3x. We need to find the derivative of f with respect to g, which is f′(g(x)), and then multiply it by the derivative of g with respect to x, which is f(g(x))0.
Differentiate f(g(x)) with respect to g: Differentiate f(g(x))=−csc(g(x)) with respect to g. Using the derivative of the cosecant function from Step 1, we get f′(g(x))=−(−csc(g(x))cot(g(x)))=csc(g(x))cot(g(x)).
Differentiate g(x) with respect to x: Differentiate g(x)=3x with respect to x. The derivative of g(x) with respect to x is g′(x)=3.
Combine results using chain rule: Combine the results from Steps 3 and 4 using the chain rule. Multiply f′(g(x)) by g′(x) to get the derivative of y with respect to x. This gives us (dy)/(dx)=csc(3x)cot(3x)×3.
Simplify the derivative: Simplify the expression for the derivative. Since there is a negative sign in the original function y=−csc(3x), we need to include this in our final derivative. The correct derivative is dxdy=−3csc(3x)cot(3x).
More problems from Write a formula for an arithmetic sequence