Verify the identity cot x*sec x*sin x = 1?

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You need to remember that cotangent function is rational:

`cot x = cos x/sin x`

You need to remember the formula of secant function:

`sec = 1/cos x`

Using the formulas above in the given product yields:

`(cos x/sin x)*(1/cos x)*sin x = 1`

Reducing like terms yields:

1 = 1

**The last line proves that the identity `cot x*sec x*sin x = 1` is checked.**

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