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Mathematics, 26.07.2019 18:30 ryanzl1291

I'm doing some advanced trig practice but i can't prove the identity sin4(x) – cos4(x) = 2sin2(x) – 1, can anyone ?

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I'm doing some advanced trig practice but i can't prove the identity sin4(x) – cos4(x) = 2sin2(x) –...
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