Giai phương trình :$\sin ^{2n+1}x+\sin ^{n}2x+\left ( \sin ^{n}x-\cos ^{n}x \right )^{2}-2=0$
$\sin ^{2n+1}x+\sin ^{n}2x+\left ( \sin ^{n}x-\cos ^{n}x \right )^{2}-2=0$
Started By quynhquynh, 06-02-2016 - 19:16
#2
Posted 06-02-2016 - 20:46
rainbow99
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Giai phương trình :$\sin ^{2n+1}x+\sin ^{n}2x+\left ( \sin ^{n}x-\cos ^{n}x \right )^{2}-2=0$
Phương trình tương đương:
$sin^{2n+1}x+sin^{n}2x+sin^{2n}x+cos^{2n}x-2sin^{n}x.cos^{n}x-2=0$
$\leftrightarrow sin^{2n+1}x-1=0$
Đến đây chắc dễ 
Edited by rainbow99, 06-02-2016 - 20:47.
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