lf x=ycos2π/3=zcos4π/3 then x.y+y.z+z.x =
a)-1 b)0 c)1 d)2
Answers
Answered by
1
Use verification method,
For this question; it means x,y,z. Should satisfy for all values, for subjective procedure it takes long, for instance answer, substitute x=0
=>y,z=0.
=>(b) 0
For this question; it means x,y,z. Should satisfy for all values, for subjective procedure it takes long, for instance answer, substitute x=0
=>y,z=0.
=>(b) 0
Answered by
0
Step-by-step explanation:
X = Y cos 2pi/3 = Z cos4pi/3
Therefore, X = Y•1/3 = Z •1/3
Hence, Y = Z.
And 3X = Y= Z
Therefore, 3X^2 + 9X^2 + 3X^2= 15 X^2
After This, Trial And Error might help you... Answer is B) 0 ( from trial and error)
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