EAMCET....

if x= y cos2pie3 = z cos4pie3

then xy+yz+xz=?

3 Answers

1
venkateshan ·

x = ycos 2Ï€/3 = zcos 4Ï€/3

implies, x = -y/2 = -z/2
-2x = y = z

Now, xy + yz + xz

= x (-2x) + (-2x)(-2x) + x (-2x)
= -2x2 + 4x2 -2x2

= 0

1
venkateshan ·

is it correct????

71
Vivek @ Born this Way ·

Yes.

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