Scanned with CamScanner · 2019. 12. 1. · cos4 x — sin4 x = cos 2x = I + sin2x (sin x + cos x)2...
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Scanned with CamScanner
Transcript of Scanned with CamScanner · 2019. 12. 1. · cos4 x — sin4 x = cos 2x = I + sin2x (sin x + cos x)2...
Scanned with CamScanner
Scanned with CamScanner
Scanned with CamScanner