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	2	chỉnh		Sửa 24-04-16 03:07 PM ๖ۣۜJinღ๖ۣۜKaido 161 4
$A=(cos^4x-sin^4x)+(cos^4x+sin^2x.cos^2x)+3sin^2x$ $=(cos^2x+sin^2x)(cos^2x-sin^2x)+cos^2x(cos^2x+sin^2x)+3sin^2x$ $=cos^2x-sin^2x+cos^2x+3sin^2x=2(sin^2x+cos^2x)=2$ Đúng click "V" và vote up cho Jin $A=(cos^4x-sin^4x)+(cos^4x+sin^2x.cos^2x)+3sin^2x$ $=(cos^2x+sin^2x)(cos^2x-sin^2x)+cos^2x(cos^2x+sin^2x)+3sin^2x$ $=cos^2x-sin^2x+cos^2x+3sin^2x=2(sin^2x+cos^2x)=2$ $A=(cos^4x-sin^4x)+(cos^4x+sin^2x.cos^2x)+3sin^2x$ $=(cos^2x+sin^2x)(cos^2x-sin^2x)+cos^2x(cos^2x+sin^2x)+3sin^2x$ $=cos^2x-sin^2x+cos^2x+3sin^2x=2(sin^2x+cos^2x)=2$ Đúng click "V" và vote up cho Jin

	1	tạo mới		Trả lời 24-04-16 03:06 PM ๖ۣۜJinღ๖ۣۜKaido 161 4
$A=(cos^4x-sin^4x)+(cos^4x+sin^2x.cos^2x)+3sin^2x$ $=(cos^2x+sin^2x)(cos^2x-sin^2x)+cos^2x(cos^2x+sin^2x)+3sin^2x$ $=cos^2x-sin^2x+cos^2x+3sin^2x=2(sin^2x+cos^2x)=2$

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hoahoa.nhynhay: . 11/5/2018 1:39:46 PM
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hoahoa.nhynhay: . 11/5/2018 1:39:48 PM
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