The simple interest on a certain sum for 7 \( \frac{1}{3} \) years at the rate of 4.5% per annum is ₹6,270. What will be the amount payable on the same sum at the rate of 8.6% per annum simple interest in 11 \( \frac{1}{2} \) years?
If x = a cosecA sinB, y = b cosecA cosB, and z = c cotA, then what is the value of \(\frac{x^2}{a^2}+\frac{y^2}{b^2}-\frac{z^2}{c^2}\)?