Practicing Success
If sin\(x\) = \(\frac{2}{5}\), then find the value of tan2\(x\)? |
\(\frac{4}{\sqrt {21 }}\) \(\frac{2}{\sqrt {21}}\) \(\frac{4\sqrt {21 }}{17}\) \(\frac{21}{17}\) |
\(\frac{4\sqrt {21 }}{17}\) |
tan2x = \(\frac{2tan\;x}{1-tan^2 x}\) & tan x = \(\frac{sin\;x}{cos\;x}\) Now, sinx = \(\frac{2}{5}\), cosx = \(\sqrt {1\;-\;sin^2 }\) = \(\frac{\sqrt{21}}{5}\) tanx = \(\frac{2}{\sqrt{21}}\) tan2x = \(\frac{2tanx}{1 - tan^2x}\) = \(\frac{4\sqrt{21}}{17}\) |