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Question

For 0< ϕ < π2, if x=n=0cos2nϕ, y=n=0sin2nϕ, z=n=0cos2n ϕ, then


A

xyz = xz + y

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B

xyz = xy + z

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C

xyz = x + y + z

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D

xyz = yz + x

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Solution

The correct options are
B

xyz = xy + z


C

xyz = x + y + z


x=1+cos2 ϕ+cos4 ϕ+....=1(1cos2 ϕ)=1sin2 ϕy=1+sin2 ϕ+sin4 ϕ+...=1(1sin2 ϕ)=1cos2 ϕz=1+cos2 ϕ sin2 ϕ+cos4 ϕ sin4 ϕ+..=1(1cos2 ϕ sin2 ϕ)

Now xyz=1sin2 ϕ cos2 ϕ(1cos2 ϕ sin2 ϕ)xy+z=1sin2 ϕ cos2ϕ+11cos2 ϕ sin2 ϕ=1sin2 ϕ cos2 ϕ(1cos2 ϕ sin2 ϕ)=xyz

which is given in (b)

Also x + y + z = xyz , which is given in (c).


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