Trying to find dy/dx of a trig function

In summary, to find dy/dx when x = tan y, you use the chain rule to differentiate both sides of the equation, which gives you 1 = (tan(dy/dx))sec^2(y) + 1. From there, you can solve for dy/dx by isolating it on one side of the equation.
  • #1
jtt
16
0

Homework Statement


find dy/dx


Homework Equations


x= tan y


The Attempt at a Solution


d/dx(x=tanY)

1=(tan(dy/dx))+sec^2+y
 
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  • #2
jtt said:

Homework Statement


find dy/dx


Homework Equations


x= tan y


The Attempt at a Solution


d/dx(x=tanY)
First off, you don't take the derivative of an equation - you take the derivative of each side of an equation.

The above should be d/dx(x) = d/dx(tan(y))

To carry out the differentiation on the right, you need to use the chain rule.

d/dx(f(u)) = d/du(f(u)) * du/dx = f'(u) * du/dx
jtt said:
1=(tan(dy/dx))+sec^2+y
Nope.
 

What is the definition of dy/dx?

The derivative, dy/dx, is a measure of the rate of change of a function y with respect to its independent variable x. It represents the slope of the tangent line to the graph of the function at a given point.

How do I find dy/dx of a trig function?

To find the derivative of a trigonometric function, you can use the power rule or the chain rule. For example, if you have a function y = sin(x), the derivative would be dy/dx = cos(x). If you have a function y = cos(2x), you would use the chain rule and the derivative would be dy/dx = -2sin(2x).

What is the relationship between trig functions and derivatives?

Trigonometric functions and their derivatives are closely related. The derivative of a trigonometric function is another trigonometric function, and the derivative of an inverse trigonometric function is an algebraic function.

Why is finding the derivative of a trig function important?

The derivative of a trigonometric function is important because it allows us to calculate the slope of a curve at any point, which is useful in many real-world applications such as physics, engineering, and economics. It also helps us understand the behavior of trigonometric functions and their graphs.

Are there any special rules for finding the derivative of trig functions?

Yes, there are some special rules for finding the derivative of trigonometric functions. For example, the derivative of sin(x) is cos(x), but the derivative of cos(x) is -sin(x). There are also specific rules for finding the derivatives of inverse trigonometric functions, such as the derivative of arctan(x) is 1/(1+x^2).

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