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milicent


1. cos^6x - sin^6x = (15/16) cos^2 x + (1/16) cos^6 x
2. sin^8x + cos^8x = (35/64) + (7/16) cos^4 x + (1/64) cos^8x
3. cos ^8x - sin^8x = (7/8)cos^2x + (1/8) cos^6 x
cám ơn nhiều :-*, mình hơi *** toán
2. sin^8x + cos^8x = (35/64) + (7/16) cos^4 x + (1/64) cos^8x
3. cos ^8x - sin^8x = (7/8)cos^2x + (1/8) cos^6 x
cám ơn nhiều :-*, mình hơi *** toán