Prove sin^4x-cos^4x=sin^2x-cos^2x

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* You can factor sin^4x-cos^4x by *difference of squares*
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It looks like the questions in trigonometric identities are harder, but once you get the idea of how to solve, you will know its easier.

mannoja
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Thanks so much! I finally understand my homework a little better!

jellyfish
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After 2 years still so useful thanks 😭😭

Akumq_