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06-07-2016
Mathematics

contestada

1-cos^2(12) - cos^2(78) simplified with radicals if needed

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mathmate mathmate

07-07-2016

hints:
Check with a calculator to see what you get.
Then try to simplify the above expression using the following identities.
1-cos^2(x)=sin^2(x)
sin(x)=cos(90-x)

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