Practicing Success
If $ sin α + cosec α = tan\frac{\pi}{3}$, then the value of $(sin^3 α +cosec^3α)$ is equal to : |
$\frac{1}{2}$ 1 0 $\frac{3}{2}$ |
0 |
sin α + cosec α = tan \(\frac{π}{3}\) { \(\frac{π}{3}\) = \(\frac{180º}{3}\) = 60º & tan60º = \(\sqrt {3 }\) } sin α + cosec α = tan60º sin α + cosec α = \(\sqrt {3 }\) sin α + \(\frac{1}{sin α}\) = \(\sqrt {3 }\) We know, If x + \(\frac{1}{x}\) = a then x³ + \(\frac{1}{x³}\) = a³ - 3a Now, sin³ α + \(\frac{1}{sin³ α}\) = (\(\sqrt {3 }\))³ - 3(\(\sqrt {3 }\)) = 3(\(\sqrt {3 }\)) - 3(\(\sqrt {3 }\)) = 0 |