I have found some of the difficult questions i maths and haven't been able to find a good way 

to solve them.Please reply if u have any good solutions to these questions

1) Find the smallest value of x for which tan(x+100)=tan(x)*tan(x-50)*tan(x+50)

ans is 30

2)the interval in which the smalleest positive root of the eqn tan(x)=x lies

 (0,pi/2)  (pi/2,pi)  (pi/2,3pi/2)   (3pi/2,2pi)  

c is the ans

3