Use trig identities to verify this expression:
((1-tan^2(x))/(sec^2(x))=cos(2x)....
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Mathematics, 30.01.2021 01:10, rayanne7099
Use trig identities to verify this expression:
((1-tan^2(x))/(sec^2(x))=cos(2x).
![answer](/tpl/images/cats/otvet.png)
Answers: 1
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