Practicing Success
If sinα + cosecα = tan (\(\frac{\pi}{3}\)) Find the value of (sin3α + cosec3α) |
\(\frac{1}{2}\) 0 1 \(\frac{3}{2}\) |
0 |
Formula I → [sinα = \(\frac{1}{cosecα}\)] Formula II → [If x + \(\frac{1}{x}\) = y and x3 + \(\frac{1}{x^3}\) = y3 - 3y] So, ⇒sinα + \(\frac{1}{sinα}\) = tan \(\frac{180°}{3}\) = tan60° ⇒ sinα + \(\frac{1}{sinα}\) = \(\sqrt {3}\) Cubing both sides, ⇒ sin3α + \(\frac{1}{sin^3α}\) = (\(\sqrt {3}\))3 - 3\(\sqrt {3}\) ⇒ sin3α + cosec3α = 0 |