Integration complicated problems

SORRY i really don't know how to put these symbols such as Integral sign ,

1. Integrate for **SEC X/3 DX** FROM (-PI) --> (PI)

( I think these problems are using substitution to solve but I just can't work it out like how to put them together to solve.

2. Integrate for **csc(x-pie) dx** from ( from 3pi/2 ---> 7pie/4 )

3. Integrate for **dx/**√** of (1- 9x^2 )** from ( 0 ---> 1/6 )

4. Integrate for **6 DX / X √ OF 25X^2 -1 **FROM (2(5√3) ---> 2/5

5. Integrate for **sec piex DX** from ( 0 ---> 1/4 )

Please tell me how to start and I can solve the rest . Thank you