The derivative of tan square x is equal to 2tanx sec^{2}x. Here we find the derivative of tan^{2}x by the chain and product rule. The derivative formula of tan square x is given below:

$\dfrac{d}{dx}(\tan^2 x)=2 \tan x \sec^2x$.

## What is the derivative of tan square x?

Let us find the derivative of tan^{2}x by the chain rule. To do so, let us put

z=tanx.

So $\dfrac{dz}{dx}=\sec^2 x$.

Now, by the chain rule, the derivative of tan square x will be equal to

$\dfrac{d}{dx}(\tan^2 x)$ = $\dfrac{d}{dx}(z^2) \times \dfrac{dz}{dx}$

= 2z × sec^{2}x by the power rule of integration: d/dx(x^{n}) = nx^{n-1}.

= 2tanx sec^{2}x as z=tanx.

So the derivative of tan square x is equal to 2tanx sec^{2}x, and this is proved by the chain rule of derivatives.

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## Derivative of tan^{2}x by Product Rule

Note that tan^{2}x is a product of two times of tanx. So the derivative of tan^{2}x by the product rule is equal to

$\dfrac{d}{dx}(\tan^2 x)$ = $\dfrac{d}{dx}(\tan x \cdot \tan x)$

= tan x $\dfrac{d}{dx}(\tan x)$ + tan x $\dfrac{d}{dx}(\tan x)$

= tanx sec^{2}x + tanx sec^{2}x as the derivative of tanx is sec^{2}x.

= 2tanx sec^{2}x.

So the derivative of tan^{2}x is tanx sec^{2}x, and this is obtained by the product rule of derivatives.

## FAQs

**Q1: If y=tan ^{2}x, then find dy/dx?**

Answer: The derivative of y=tan^{2}x is dy/dx = 2 tanx sec^{2}x.

**Q2: What is the derivative of tan^{2}x?**

Answer: The derivative of tan^{2}x is 2sec^{2}x tanx.