Nilai cos4x−sin4xcos8x\frac{\cos4x-\sin4x}{\cos8x}cos8xcos4x−sin4x sama dengan ....
1cos4x+sin4x\frac{1}{\cos4x+\sin4x}cos4x+sin4x1
1cos4x−sin4x\frac{1}{\cos4x-\sin4x}cos4x−sin4x1
cos4x+sin4x\cos4x+\sin4xcos4x+sin4x
cos4x−sin4x\cos4x-\sin4xcos4x−sin4x
1cos4x\frac{1}{\cos4x}cos4x1