Asked by Don

If sinx = 1/4 Find the exact value of cos2x
I used the formula for double angle identities :
cos2x = 1-2sin^2x
and got the answer 1/2
The book says the answer is 7/8
How would they get to that conclusion?

Answers

Answered by Don
Found my mistake ....
All is good now
Thanks for the help earlier Damon
Don
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