Simplify (1 − cos x)(1 + cos x).
1
cos2 x
sin2 x
tan2 x
1 answer:
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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