The selling price of 20 books is equal to the cost price of 6 books. Find the loss or gain percentage.
70% gain
\( \frac{50}{7} \)% gain
\( \frac{50}{7} \)% loss
70% loss
Find the roots of \( x^{-4} - 10x^{-2} + 9 = 0 \).
±1, ±\( \frac{1}{4} \)
±1, ±\( \frac{2}{3} \)
±1, ±\( \frac{1}{5} \)
±1, ±\( \frac{1}{3} \)
If \(\sqrt{3}\) tanA = 3 sinA, find the value of (2\(\sqrt{3}\) cosecA × tanA).