[toán 10] chứng minh đăng thức lượng giác !

N

nguyenbahiep1

[laTEX] M = (sin^4a+cos^4a)^2 -2sin^4a.cos^4a - 2.( 1 -sin^2a.cos^2a)^2 \\ \\ M = (1 -2sin^2a.cos^2a)^2 - 2sin^4a.cos^4a -2sin^4a.cos^4a +4sin^2a.cos^2a - 2 \\ \\ M = -1[/laTEX]
 
O

oanh27

jup vs

(sinx + cosx)2 + sin bình x = 1
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