Find all solutions in the interval [0, 2π).

7 tan3x - 21 tan x = 0

Hence, all the solutions in the interval [0,2π) are:

We are asked to find the solution of the trignometric identity which is given by:

On dividing both side by 7 we get:

i.e.

Either

i.e.

or

If

and if

Hence, all solutions are:

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

pie chart because it is in percents ( % )