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Is cos² (2x)- sin² (2x)=0 an identity

Is cos² (2x)- sin² (2x)=0 an identity
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Is cos² (2x)- sin² (2x)=0 an identity

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User Sourav Prem
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7.9k points

1 Answer

4 votes

I asked my brother and he says no

answered
User Hooman Bahreini
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7.5k points
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