3root5-5root2 9root5+3root2
In an ap 5,
11,17,23,---------etc find $5,$12,$30
In an ap if a=4,d=6 find T2,T5, and t50
In an ap if 2,6,10,14,--------etc find t7 ,12 ,t100
Cos2A+cos2B+cos2C=1
In an ap ifa =4,d=6 find T2, T5,and t50