They said start with x so x is 90° then the others can be 90° but may hav other angles
Since cosecant is 1/sine and since cosine is just sine shifted by π/2, the reciprocal of the cosine, that is y = sec x must have the same range.
So, the first brand has 9% vinegar, and say we use "x" amount of it, then, the amount of vinegar in "x" is 9% of x, or (9/100) * x, 0.09x.
the second brand has 14% of vinegar, and if we use say "y" amount of it, then the amount of vinegar in "y" is really just 14% of "y" or, (14/100) * y, 0.14y.

so, whatever "x" and "y" are, we know that
x + y = 230.
and we also know that their concentration amounts will also add up,
0.09x + 0.14y = 29.9.

how many milliliters will it be for the second brand? well, y = 230 - x.
2x-3yi=14+12i
=> 2x=14; -3yi=12i => x=7; y=-4
1/52, as there is only 1 ace of hearts in a standard deck (no jokers) of 52 cards.