x=?
2. i to the power of i =?
3.(1+(1/x))^x = (1+(1/2012))^2011
x=?
4. square root i =?
5. i!
6. 0.1!
7. 6.9!
8. 2^x = -1
x=?
9. sin(i) =?
10. cos(i) =?
11. tan(i)=?
please give step
更新1:
how to calculate 2^x + 2^-x = 2.5 , x=?
