Question

given only the value of sin θ, can you calculate the value of cos2θ ?

given only the value of sin θ, can you calculate the value of cos2θ ?
Math   Precalculus   
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Homework Answers

Answer #1

Yes,

- - - - (1)

Also

So ​​​​​​

So putting the value of in the

equation (1)

We get,

So ​​​​​​

Now you can plug the value of to find the value of

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