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30-01-2020
Mathematics

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Simplify (1 − cos x)(1 + cos x).

1
cos2 x
sin2 x
tan2 x

Respuesta :

cecex87 cecex87

30-01-2020

Answer

The expression is equivalent to sin^{2}x

The first step is to multiply the two expressions between parentheses :
(II)
There is a trigonometric identity that states :

Working with this expression :
⇒
(I)
Using the equation (I) in (II) :
⇒

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