If theta =1/3, then find the value of cos theta

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If $s i n θ + s i n^{2} θ + s i n^{3} θ = 1$ ,then find the value of $c o s^{6} θ - 4 c o s^{4} θ + 8 c o s^{2} θ$ .

3 tan θ tan α = 1

\frac{cos (θ - α)}{cos (θ + α)} =

If s i n θ = \frac{1}{2}

θ

then find the value of (3 c o s θ - 4 c o s^{3} θ) .

sin θ - cos θ = 1

{sin}^{3} θ - {cos}^{3} θ

tan θ = \sqrt{3}

θ

1 + cos θ

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