Practicing Success
If tan (\(\frac{π}{2}\) - 3θ) = \(\sqrt {3 }\), the value of cos6 θ is? |
\(\frac{\sqrt {3 }}{2}\) \(\frac{1}{2}\) 1 \(\sqrt {2 }\) |
\(\frac{1}{2}\) |
tan (\(\frac{π}{2}\) - 3θ) = \(\sqrt {3 }\) ⇒ tan (\(\frac{π}{2}\) - 3θ) = tan 60° ⇒ 90 - 3θ = 60° ⇒ 3θ = 30 ⇒ θ = 10° cos 6θ = cos 60° = \(\frac{1}{2}\) |