Factorize completely ac - 2bc - a\(^2\) + 4b\(^2\)
Find the sum to infinity of the series 1/2 , 1/6, 1/18, .....
The length L of a simple pendulum varies directly as the square of its period T. If a pendulum with period 4 sec. is 64 cm long, find the length of pendulum whose period is 9 sec
