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# Simplify sin^2(x)/(1 - sin^2(x))

##### Administrator

**Staff member**

We know from the pythagorean theorem:

**sin^2(x) + cos^2(x) = 1**

**Subtract sin^2(x) from each side and we get:**

**cos^2(x) = 1 - ****sin^2(x)**

**We can rewrite our original expression as:**

**sin^2(x)/cos^2(x)**

**But this expression equals tan^2(x)**